Index: t3lib/class.t3lib_tcemain.php
===================================================================
--- t3lib/class.t3lib_tcemain.php	(revision 5017)
+++ t3lib/class.t3lib_tcemain.php	(working copy)
@@ -1452,7 +1452,11 @@
 		$value = $this->convNumEntityToByteValue($value);
 
 			// When values are sent as group or select they come as comma-separated values which are exploded by this function:
-		$valueArray = $this->checkValue_group_select_explodeSelectGroupValue($value);
+		if ($tcaFieldConf['maxItems'] > 1) {
+			$valueArray = $this->checkValue_group_select_explodeSelectGroupValue($value);
+		} else {
+			$valueArray = array($value);
+		}
 
 			// If not multiple is set, then remove duplicates:
 		if (!$tcaFieldConf['multiple'])	{
Index: t3lib/class.t3lib_transferdata.php
===================================================================
--- t3lib/class.t3lib_transferdata.php	(revision 5017)
+++ t3lib/class.t3lib_transferdata.php	(working copy)
@@ -424,7 +424,11 @@
 		global $TCA;
 
 			// Initialize:
-		$elements = t3lib_div::trimExplode(',',$data,1);	// Current data set.
+		if ($fieldConfig['config']['maxitems'] > 1) {	
+			$elements = t3lib_div::trimExplode(',', $data, 1);	// Current data set.
+		} else {
+			$elements = array($data);
+		}
 		$dataAcc=array();	// New data set, ready for interface (list of values, rawurlencoded)
 
 			// For list selectors (multi-value):