diff --git a/ChangeLog b/ChangeLog
index 90b6922d60ba35bbf6730f6b260233c8aa4882b7..22a2884e5fe0aafd0df72cc59177e0e730f40004 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -22,6 +22,9 @@ Fix: Page load not ending when large number of thirdparies. We
      combo feature that is root cause of problem.
 Fix: [ bug #1231 ] PDF always generated in interventions
 Fix: Be sure there is no duplicate default rib.
+Fix: Enable extrafields for customer order, proposal and invoice lines. This feature
+     was developed for 3.5 but was disabled (hidden) because of a bug not possible to
+     fix enough quickly for 3.5.0 release. 
 
 ***** ChangeLog for 3.5 compared to 3.4.* *****
 For users:
diff --git a/htdocs/comm/propal.php b/htdocs/comm/propal.php
index ef37fa534bd3240a2bfae51647f90f5ee44aaf62..48cd8531a69ea3966a0421a737a736254244ab96 100644
--- a/htdocs/comm/propal.php
+++ b/htdocs/comm/propal.php
@@ -665,7 +665,7 @@ else if (($action == 'addline' || $action == 'addline_predef') && $user->rights-
 	//Extrafields
 	$extrafieldsline = new ExtraFields($db);
 	$extralabelsline =$extrafieldsline->fetch_name_optionals_label($object->table_element_line);
-	$array_option = $extrafieldsline->getOptionalsFromPost($extralabelsline);
+	$array_option = $extrafieldsline->getOptionalsFromPost($extralabelsline,$predef);
 	//Unset extrafield
 	if (is_array($extralabelsline))
 	{
diff --git a/htdocs/commande/fiche.php b/htdocs/commande/fiche.php
index 4c400f37a7f3828a51c154b292a2cc93ebdb2f5b..7a5b74165bbf7a46166ed0ea308bc480cf1cdf53 100644
--- a/htdocs/commande/fiche.php
+++ b/htdocs/commande/fiche.php
@@ -599,7 +599,7 @@ else if ($action == 'addline' && $user->rights->commande->creer)
 	//Extrafields
 	$extrafieldsline = new ExtraFields($db);
 	$extralabelsline =$extrafieldsline->fetch_name_optionals_label($object->table_element_line);
-	$array_option = $extrafieldsline->getOptionalsFromPost($extralabelsline);
+	$array_option = $extrafieldsline->getOptionalsFromPost($extralabelsline,$predef);
 	//Unset extrafield
 	if (is_array($extralabelsline))
 	{
@@ -613,12 +613,12 @@ else if ($action == 'addline' && $user->rights->commande->creer)
 	if ((empty($idprod) || GETPOST('usenewaddlineform')) && ($price_ht < 0) && ($qty < 0))
 	{
 		setEventMessage($langs->trans('ErrorBothFieldCantBeNegative', $langs->transnoentitiesnoconv('UnitPriceHT'), $langs->transnoentitiesnoconv('Qty')), 'errors');
-		$error = true;
+		$error++;
 	}
 	if (empty($idprod) && GETPOST('type') < 0)
 	{
 		setEventMessage($langs->trans('ErrorFieldRequired', $langs->transnoentitiesnoconv('Type')), 'errors');
-		$error = true;
+		$error++;
 	}
 	if ((empty($idprod) || GETPOST('usenewaddlineform')) && (!($price_ht >= 0) || $price_ht == ''))	// Unit price can be 0 but not ''
 	{
@@ -628,12 +628,12 @@ else if ($action == 'addline' && $user->rights->commande->creer)
 	if ($qty == '')
 	{
 		setEventMessage($langs->trans('ErrorFieldRequired', $langs->transnoentitiesnoconv('Qty')), 'errors');
-		$error = true;
+		$error++;
 	}
 	if (empty($idprod) && empty($product_desc))
 	{
 		setEventMessage($langs->trans('ErrorFieldRequired', $langs->transnoentitiesnoconv('Description')), 'errors');
-		$error = true;
+		$error++;
 	}
 
 	if (! $error && ($qty >= 0) && (! empty($product_desc) || ! empty($idprod)))
@@ -2484,7 +2484,7 @@ else
 				}
 
 				// Create bill and Classify billed
-				// Note: Even if module invoice is not enabled, we should be able to use button "Classified billed" 
+				// Note: Even if module invoice is not enabled, we should be able to use button "Classified billed"
 				if ($object->statut > 0  && ! $object->billed)
 				{
 					if (! empty($conf->facture->enabled) && $user->rights->facture->creer && empty($conf->global->WORKFLOW_DISABLE_CREATE_INVOICE_FROM_ORDER))
diff --git a/htdocs/compta/facture.php b/htdocs/compta/facture.php
index a03dddfc51525350132996cfba9f99fc4d02b037..9a665578c28cfd8dcb85427f1c5059968288ed38 100644
--- a/htdocs/compta/facture.php
+++ b/htdocs/compta/facture.php
@@ -1157,13 +1157,13 @@ else if (($action == 'addline' || $action == 'addline_predef') && $user->rights-
 	//Extrafields
 	$extrafieldsline = new ExtraFields($db);
 	$extralabelsline =$extrafieldsline->fetch_name_optionals_label($object->table_element_line);
-	$array_option = $extrafieldsline->getOptionalsFromPost($extralabelsline);
+	$array_option = $extrafieldsline->getOptionalsFromPost($extralabelsline,$predef);
 	//Unset extrafield
 	if (is_array($extralabelsline))
 	{
 		// Get extra fields
 		foreach ($extralabelsline as $key => $value) {
-			unset($_POST["options_".$key]);
+			unset($_POST["options_".$key.$predef]);
 		}
 	}
 
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 8f45a53e059cffb3c48f795ef674f4d32929565a..2581151a649372339e3b13678b64f92a222abfd7 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -2236,13 +2236,14 @@ abstract class CommonObject
    /**
      * Function to show lines of extrafields with output datas
      *
-     * @param	object	$extrafields	extrafield Object
+     * @param	object	$extrafields	Extrafield Object
      * @param	string	$mode			Show output (view) or input (edit) for extrafield
-	 * @param	array	$params			optionnal parameters
+	 * @param	array	$params			Optionnal parameters
+	 * @param	string	$keyprefix		Prefix string to add into name and id of field (can be used to avoid duplicate names)
      *
      * @return string
      */
-    function showOptionals($extrafields,$mode='view',$params=0)
+    function showOptionals($extrafields, $mode='view', $params=0, $keyprefix='')
     {
 		global $_POST;
 
@@ -2310,7 +2311,7 @@ abstract class CommonObject
 						$out .= $extrafields->showOutputField($key,$value);
 						break;
 					case "edit":
-						$out .= $extrafields->showInputField($key,$value);
+						$out .= $extrafields->showInputField($key,$value,'',$keyprefix);
 						break;
 					}
 
diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 8227bfbc0e7cdc954ee91f3e34fff1c5a7c38ffa..399a87d30afd182536da64460f12672de35eb1d6 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -571,14 +571,15 @@ class ExtraFields
 
 
 	/**
-	 *  Return HTML string to put an input field into a page
+	 * Return HTML string to put an input field into a page
 	 *
-	 *  @param	string	$key             Key of attribute
-	 *  @param  string	$value           Value to show (for date type it must be in timestamp format)
-	 *  @param  string	$moreparam       To add more parametes on html input tag
-	 *  @return	void
+	 * @param	string	$key            Key of attribute
+	 * @param	string	$value          Value to show (for date type it must be in timestamp format)
+	 * @param	string	$moreparam      To add more parametes on html input tag
+	 * @param	string	$keyprefix		Prefix string to add into name and id of field (can be used to avoid duplicate names)
+	 * @return	void
 	 */
-	function showInputField($key,$value,$moreparam='')
+	function showInputField($key,$value,$moreparam='',$keyprefix='')
 	{
 		global $conf,$langs;
 
@@ -620,23 +621,23 @@ class ExtraFields
 			if(!$required && $value == '')
 				$value = '-1';
 
-			$out = $formstat->select_date($value, 'options_'.$key, $showtime, $showtime, $required, '', 1, 1, 1, 0, 1);
-			//$out='<input type="text" name="options_'.$key.'" size="'.$showsize.'" maxlength="'.$newsize.'" value="'.$value.'"'.($moreparam?$moreparam:'').'>';
+			$out = $formstat->select_date($value, 'options_'.$key.$keyprefix, $showtime, $showtime, $required, '', 1, 1, 1, 0, 1);
+			// TODO Missing to add $moreparam
 		}
 		elseif (in_array($type,array('int')))
 		{
 			$tmp=explode(',',$size);
 			$newsize=$tmp[0];
-			$out='<input type="text" class="flat" name="options_'.$key.'" size="'.$showsize.'" maxlength="'.$newsize.'" value="'.$value.'"'.($moreparam?$moreparam:'').'>';
+			$out='<input type="text" class="flat" name="options_'.$key.$keyprefix.'" size="'.$showsize.'" maxlength="'.$newsize.'" value="'.$value.'"'.($moreparam?$moreparam:'').'>';
 		}
 		elseif ($type == 'varchar')
 		{
-			$out='<input type="text" class="flat" name="options_'.$key.'" size="'.$showsize.'" maxlength="'.$size.'" value="'.$value.'"'.($moreparam?$moreparam:'').'>';
+			$out='<input type="text" class="flat" name="options_'.$key.$keyprefix.'" size="'.$showsize.'" maxlength="'.$size.'" value="'.$value.'"'.($moreparam?$moreparam:'').'>';
 		}
 		elseif ($type == 'text')
 		{
 			require_once DOL_DOCUMENT_ROOT.'/core/class/doleditor.class.php';
-			$doleditor=new DolEditor('options_'.$key,$value,'',200,'dolibarr_notes','In',false,false,! empty($conf->fckeditor->enabled) && $conf->global->FCKEDITOR_ENABLE_SOCIETE,5,100);
+			$doleditor=new DolEditor('options_'.$key.$keyprefix,$value,'',200,'dolibarr_notes','In',false,false,! empty($conf->fckeditor->enabled) && $conf->global->FCKEDITOR_ENABLE_SOCIETE,5,100);
 			$out=$doleditor->Create(1);
 		}
 		elseif ($type == 'boolean')
@@ -647,30 +648,30 @@ class ExtraFields
 			} else {
 				$checked=' value="1" ';
 			}
-			$out='<input type="checkbox" class="flat" name="options_'.$key.'" '.$checked.' '.($moreparam?$moreparam:'').'>';
+			$out='<input type="checkbox" class="flat" name="options_'.$key.$keyprefix.'" '.$checked.' '.($moreparam?$moreparam:'').'>';
 		}
 		elseif ($type == 'mail')
 		{
-			$out='<input type="text" class="flat" name="options_'.$key.'" size="32" value="'.$value.'">';
+			$out='<input type="text" class="flat" name="options_'.$key.$keyprefix.'" size="32" value="'.$value.'" '.($moreparam?$moreparam:'').'>';
 		}
 		elseif ($type == 'phone')
 		{
-			$out='<input type="text" class="flat" name="options_'.$key.'"  size="20" value="'.$value.'">';
+			$out='<input type="text" class="flat" name="options_'.$key.$keyprefix.'"  size="20" value="'.$value.'" '.($moreparam?$moreparam:'').'>';
 		}
 		elseif ($type == 'price')
 		{
-			$out='<input type="text" class="flat" name="options_'.$key.'"  size="6" value="'.price($value).'"> '.$langs->getCurrencySymbol($conf->currency);
+			$out='<input type="text" class="flat" name="options_'.$key.$keyprefix.'"  size="6" value="'.price($value).'" '.($moreparam?$moreparam:'').'> '.$langs->getCurrencySymbol($conf->currency);
 		}
 		elseif ($type == 'double')
 		{
 			if (!empty($value)) {
 				$value=price($value);
 			}
-			$out='<input type="text" class="flat" name="options_'.$key.'"  size="6" value="'.$value.'"> ';
+			$out='<input type="text" class="flat" name="options_'.$key.$keyprefix.'"  size="6" value="'.$value.'" '.($moreparam?$moreparam:'').'> ';
 		}
 		elseif ($type == 'select')
 		{
-			$out='<select class="flat" name="options_'.$key.'">';
+			$out='<select class="flat" name="options_'.$key.$keyprefix.'" '.($moreparam?$moreparam:'').'>';
 			foreach ($param['options'] as $key=>$val )
 			{
 				list($val, $parent) = explode('|', $val);
@@ -683,7 +684,7 @@ class ExtraFields
 		}
 		elseif ($type == 'sellist')
 		{
-			$out='<select class="flat" name="options_'.$key.'">';
+			$out='<select class="flat" name="options_'.$key.$keyprefix.'" '.($moreparam?$moreparam:'').'>';
 			if (is_array($param['options']))
 			{
 				$param_list=array_keys($param['options']);
@@ -820,7 +821,7 @@ class ExtraFields
 			foreach ($param['options'] as $keyopt=>$val )
 			{
 
-				$out.='<input class="flat" type="checkbox" name="options_'.$key.'[]"';
+				$out.='<input class="flat" type="checkbox" name="options_'.$key.$keyprefix.'[]" '.($moreparam?$moreparam:'');
 				$out.=' value="'.$keyopt.'"';
 
 				if ((is_array($value_arr)) && in_array($keyopt,$value_arr)) {
@@ -837,7 +838,7 @@ class ExtraFields
 			$out='';
 			foreach ($param['options'] as $keyopt=>$val )
 			{
-				$out.='<input class="flat" type="radio" name="options_'.$key.'"';
+				$out.='<input class="flat" type="radio" name="options_'.$key.$keyprefix.'" '.($moreparam?$moreparam:'');
 				$out.=' value="'.$keyopt.'"';
 				$out.= ($value==$keyopt?'checked="checked"':'');
 				$out.='/>'.$val.'<br>';
@@ -1085,9 +1086,10 @@ class ExtraFields
 	 * return array_options array for object by extrafields value (using for data send by forms)
 	 *
 	 * @param   array	$extralabels    $array of extrafields
+	 * @param	string	$keyprefix		Prefix string to add into name and id of field (can be used to avoid duplicate names)
 	 * @return	int						1 if array_options set / 0 if no value
 	 */
-	function getOptionalsFromPost($extralabels)
+	function getOptionalsFromPost($extralabels,$keyprefix='')
 	{
 		global $_POST;
 
@@ -1102,23 +1104,24 @@ class ExtraFields
 				if (in_array($key_type,array('date','datetime')))
 				{
 					// Clean parameters
-					$value_key=dol_mktime($_POST["options_".$key."hour"], $_POST["options_".$key."min"], 0, $_POST["options_".$key."month"], $_POST["options_".$key."day"], $_POST["options_".$key."year"]);
+					$value_key=dol_mktime($_POST["options_".$key.$keyprefix."hour"], $_POST["options_".$key.$keyprefix."min"], 0, $_POST["options_".$key.$keyprefix."month"], $_POST["options_".$key.$keyprefix."day"], $_POST["options_".$key.$keyprefix."year"]);
 				}
 				else if (in_array($key_type,array('checkbox')))
 				{
-					$value_arr=GETPOST("options_".$key);
+					$value_arr=GETPOST("options_".$key.$keyprefix);
 					$value_key=implode($value_arr,',');
 				}
 				else if (in_array($key_type,array('price','double')))
 				{
-					$value_arr=GETPOST("options_".$key);
+					$value_arr=GETPOST("options_".$key.$keyprefix);
 					$value_key=price2num($value_arr);
 				}
 				else
 				{
-					$value_key=GETPOST("options_".$key);
+					$value_key=GETPOST("options_".$key.$keyprefix);
 				}
-				$array_options["options_".$key]=$value_key;
+
+				$array_options["options_".$key]=$value_key;	// No keyprefix here. keyprefix is used only for read.
 			}
 
 			return $array_options;
diff --git a/htdocs/core/lib/invoice.lib.php b/htdocs/core/lib/invoice.lib.php
index b3983a0c5ab2cc76fa4a1e13d08774e8c00d5ffe..0142bfae11397f2a75c69757132b318bbe79b8ee 100644
--- a/htdocs/core/lib/invoice.lib.php
+++ b/htdocs/core/lib/invoice.lib.php
@@ -132,13 +132,10 @@ function invoice_admin_prepare_head($object)
 	$head[$h][2] = 'attributes';
 	$h++;
 
-    if ($conf->global->MAIN_FEATURES_LEVEL >= 2)	// FIXME This feature will works when form for predefined and free product will be merged, otherwise there is duplicate fields with same name
-    {
 	$head[$h][0] = DOL_URL_ROOT.'/compta/facture/admin/facturedet_cust_extrafields.php';
 	$head[$h][1] = $langs->trans("ExtraFieldsLines");
 	$head[$h][2] = 'attributeslines';
 	$h++;
-    }
 
 	complete_head_from_modules($conf,$langs,$object,$head,$h,'invoice_admin','remove');
 
diff --git a/htdocs/core/lib/order.lib.php b/htdocs/core/lib/order.lib.php
index 46dca55fb3ad6212ea2405c48683a339d826d967..216887139d4ff0a94f230fe29b3332e1dfb1912d 100644
--- a/htdocs/core/lib/order.lib.php
+++ b/htdocs/core/lib/order.lib.php
@@ -138,13 +138,10 @@ function order_admin_prepare_head($object)
 	$head[$h][2] = 'attributes';
 	$h++;
 
-    if ($conf->global->MAIN_FEATURES_LEVEL >= 2)	// FIXME This feature will works when form for predefined and free product will be merged, otherwise there is duplicate fields with same name
-    {
 	$head[$h][0] = DOL_URL_ROOT.'/admin/orderdet_extrafields.php';
 	$head[$h][1] = $langs->trans("ExtraFieldsLines");
 	$head[$h][2] = 'attributeslines';
 	$h++;
-    }
 
 	complete_head_from_modules($conf,$langs,$object,$head,$h,'order_admin','remove');
 
diff --git a/htdocs/core/lib/propal.lib.php b/htdocs/core/lib/propal.lib.php
index 8f5e61eeceec0f56ad38878ab2e04393154e0a8a..d43885adf95376015e46088764acd085ce834dc2 100644
--- a/htdocs/core/lib/propal.lib.php
+++ b/htdocs/core/lib/propal.lib.php
@@ -136,13 +136,10 @@ function propal_admin_prepare_head($object)
     $head[$h][2] = 'attributes';
     $h++;
 
-    if ($conf->global->MAIN_FEATURES_LEVEL >= 2)	// FIXME This feature will works when form for predefined and free product will be merged, otherwise there is duplicate fields with same name
-    {
     $head[$h][0] = DOL_URL_ROOT.'/comm/admin/propaldet_extrafields.php';
     $head[$h][1] = $langs->trans("ExtraFieldsLines");
     $head[$h][2] = 'attributeslines';
     $h++;
-    }
 
 	complete_head_from_modules($conf,$langs,$object,$head,$h,'propal_admin','remove');
 
diff --git a/htdocs/core/tpl/freeproductline_create.tpl.php b/htdocs/core/tpl/freeproductline_create.tpl.php
index f88d7741ed8c9d7a3d46a47edc83ac46181f54ce..41eccdddda9d07ff9f1e4ceb90e5bb26d8fba21a 100644
--- a/htdocs/core/tpl/freeproductline_create.tpl.php
+++ b/htdocs/core/tpl/freeproductline_create.tpl.php
@@ -126,13 +126,20 @@ else {
 			<input type="text" size="5" name="buying_price" class="flat" value="<?php echo (isset($_POST["buying_price"])?$_POST["buying_price"]:''); ?>">
 		</td>
 		<?php
+		$colspan++;
+		$coldisplay++;
+
 		if ($user->rights->margins->creer)
 		{
 			if (! empty($conf->global->DISPLAY_MARGIN_RATES)) {
 				echo '<td align="right" class="nowrap"><input type="text" size="2" name="np_marginRate" value="'.(isset($_POST["np_marginRate"])?$_POST["np_marginRate"]:'').'"><span class="hideonsmartphone">%</span></td>';
+				$colspan++;
+				$coldisplay++;
 			}
 			if (! empty($conf->global->DISPLAY_MARK_RATES)) {
 				echo '<td align="right" class="nowrap"><input type="text" size="2" name="np_markRate" value="'.(isset($_POST["np_markRate"])?$_POST["np_markRate"]:'').'"><span class="hideonsmartphone">%</span></td>';
+				$colspan++;
+				$coldisplay++;
 			}
 		}
 		else
@@ -164,7 +171,7 @@ else {
 			$newline = new FactureLigne($this->db);
 		}
 		if (is_object($newline)) {
-			print $newline->showOptionals($extrafieldsline,'edit',array('style'=>$bcnd[$var],'colspan'=>$coldisplay+8));
+			print $newline->showOptionals($extrafieldsline, 'edit', array('style'=>$bcnd[$var], 'colspan'=>$coldisplay+8));
 		}
 	}
 		?>
diff --git a/htdocs/core/tpl/predefinedproductline_create.tpl.php b/htdocs/core/tpl/predefinedproductline_create.tpl.php
index ec430015135a267ed12c72d6d4e8ac8227f8a0f3..acd06c807d3990758c0c42901dd5a74073f0b724 100644
--- a/htdocs/core/tpl/predefinedproductline_create.tpl.php
+++ b/htdocs/core/tpl/predefinedproductline_create.tpl.php
@@ -134,13 +134,20 @@ else {
 			<input type="text" size="5" id="buying_price_predef" name="buying_price_predef" class="flat" value="<?php echo (isset($_POST["buying_price_predef"])?$_POST["buying_price_predef"]:''); ?>">
 		</td>
 		<?php
+		$colspan++;
+		$coldisplay++;
+
 		if ($user->rights->margins->creer)
 		{
 			if (! empty($conf->global->DISPLAY_MARGIN_RATES)) {
 				echo '<td align="right"><input type="text" size="2" name="np_marginRate_predef" value="'.(isset($_POST["np_marginRate_predef"])?$_POST["np_marginRate_predef"]:'').'">%</td>';
+				$colspan++;
+				$coldisplay++;
 			}
 			if (! empty($conf->global->DISPLAY_MARK_RATES)) {
 				echo '<td align="right"><input type="text" size="2" name="np_markRate_predef" value="'.(isset($_POST["np_markRate_predef"])?$_POST["np_markRate_predef"]:'').'">%</td>';
+				$colspan++;
+				$coldisplay++;
 			}
 		}
 		else
@@ -172,7 +179,7 @@ else {
 			$newline = new FactureLigne($this->db);
 		}
 		if (is_object($newline)) {
-			print $newline->showOptionals($extrafieldsline,'edit',array('style'=>$bcnd[$var],'colspan'=>$coldisplay+5));
+			print $newline->showOptionals($extrafieldsline, 'edit', array('style'=>$bcnd[$var],'colspan'=>$coldisplay+5), '_predef');
 		}
 	}
 	?>