Try to aplpy enhancements defined into

http://www.dolibarr.fr/forum/527-bugs-sur-la-version-stable-courante/38958-resolu-probleme-exports#38968

htdocs/core/modules/export/export_csv.modules.php

@@ -26,8 +26,7 @@ require_once DOL_DOCUMENT_ROOT .'/core/modules/export/modules_export.php';
 
 
 /**
- *	    \class      ExportCsv
- *		\brief      Class to build export files with format CSV
+ *	Class to build export files with format CSV
  */
 class ExportCsv extends ModeleExports
 {
@@ -239,7 +238,8 @@ class ExportCsv extends ModeleExports
 		$this->col=0;
 		foreach($array_selected_sorted as $code => $value)
 		{
-			$alias=str_replace(array('.','-'),'_',$code);
+			if (strpos($code,' as ') == 0) $alias=str_replace(array('.','-'),'_',$code);
+			else $alias=substr($code, strpos($code, ' as ') + 4);
 			if (empty($alias)) dol_print_error('','Bad value for field with key='.$code.'. Try to redefine export.');
 			$newvalue=$outputlangs->convToOutputCharset($objp->$alias);
 

htdocs/core/modules/export/export_excel.modules.php

@@ -28,8 +28,7 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 
 
 /**
- *	\class      ExportExcel
- *	\brief      Class to build export files with Excel format
+ *	Class to build export files with Excel format
  */
 class ExportExcel extends ModeleExports
 {
@@ -276,7 +275,8 @@ class ExportExcel extends ModeleExports
 
 		foreach($array_selected_sorted as $code => $value)
 		{
-			$alias=str_replace(array('.','-'),'_',$code);
+			if (strpos($code,' as ') == 0) $alias=str_replace(array('.','-'),'_',$code);
+			else $alias=substr($code, strpos($code, ' as ') + 4);
             if (empty($alias)) dol_print_error('','Bad value for field with code='.$code.'. Try to redefine export.');
             $newvalue=$objp->$alias;
 

htdocs/core/modules/export/export_excel2007.modules.php

@@ -29,8 +29,7 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 
 
 /**
- *	\class      ExportExcel2007
- *	\brief      Class to build export files with Excel format
+ *	Class to build export files with Excel format
  */
 class ExportExcel2007 extends ExportExcel
 {
@@ -277,7 +276,8 @@ class ExportExcel2007 extends ExportExcel
 
 		foreach($array_selected_sorted as $code => $value)
 		{
-			$alias=str_replace(array('.','-'),'_',$code);
+			if (strpos($code,' as ') == 0) $alias=str_replace(array('.','-'),'_',$code);
+			else $alias=substr($code, strpos($code, ' as ') + 4);
             if (empty($alias)) dol_print_error('','Bad value for field with code='.$code.'. Try to redefine export.');
             $newvalue=$objp->$alias;
 

htdocs/core/modules/export/export_tsv.modules.php

@@ -27,8 +27,7 @@ require_once DOL_DOCUMENT_ROOT .'/core/modules/export/modules_export.php';
 
 
 /**
- *	    \class      ExportTsv
- *		\brief      Class to build export files with format TSV
+ *	Class to build export files with format TSV
  */
 class ExportTsv extends ModeleExports
 {
@@ -212,7 +211,8 @@ class ExportTsv extends ModeleExports
 		$this->col=0;
  		foreach($array_selected_sorted as $code => $value)
         {
-            $alias=str_replace(array('.','-'),'_',$code);
+			if (strpos($code,' as ') == 0) $alias=str_replace(array('.','-'),'_',$code);
+			else $alias=substr($code, strpos($code, ' as ') + 4);
             if (empty($alias)) dol_print_error('','Bad value for field with code='.$code.'. Try to redefine export.');
             $newvalue=$objp->$alias;