Merge pull request #5276 from atm-maxime/fix_import_mapping

FIX #5229

htdocs/imports/import.php

@@ -617,6 +617,10 @@ if ($step == 4 && $datatoimport)
 	    $obj->separator = $separator;
 	    $obj->enclosure = $enclosure;
 	}
+	
+	if(!empty(GETPOST('update'))) {
+		$array_match_file_to_database=array();
+	}
 
 	// Load source fields in input file
 	$fieldssource=array();
@@ -738,7 +742,7 @@ if ($step == 4 && $datatoimport)
 		print '<input type="text" size="1" name="separator" value="'.htmlentities($separator).'"/>';
 		print '&nbsp;&nbsp;&nbsp;&nbsp;'.$langs->trans("Enclosure").' : ';
 		print '<input type="text" size="1" name="enclosure" value="'.htmlentities($enclosure).'"/>';
-		print '<input type="submit" value="'.$langs->trans('Update').'" class="button" />';
+		print '<input name="update" type="submit" value="'.$langs->trans('Update').'" class="button" />';
 		print '</form>';
 		print '</td></tr>';
     }