Index: t3lib/class.t3lib_tceforms.php
===================================================================
--- t3lib/class.t3lib_tceforms.php	(Revision 10011)
+++ t3lib/class.t3lib_tceforms.php	(Arbeitskopie)
@@ -883,8 +883,13 @@
 					$PA['label'] = $this->sL($PA['label']);
 						// JavaScript code for event handlers:
 					$PA['fieldChangeFunc'] = array();
-					$PA['fieldChangeFunc']['TBE_EDITOR_fieldChanged'] = "TBE_EDITOR.fieldChanged('" . $table . "','" . $row['uid'] . "','" . $field . "','" . $PA['itemFormElName'] . "');";
-					$PA['fieldChangeFunc']['alert'] = $alertMsgOnChange;
+					$PA['fieldChangeFunc']['TBE_EDITOR_fieldChanged'] = '';
+						// replace the existing item, if only one allowed and already set
+					if (intval($PA['fieldConf']['config']['maxitems']) === 1) {
+						$PA['fieldChangeFunc']['TBE_EDITOR_fieldChanged'] .= "setFormValueManipulate('" . $PA['itemFormElName'] . "','Remove'); ";
+					}
+					$PA['fieldChangeFunc']['TBE_EDITOR_fieldChanged'] .= "TBE_EDITOR.fieldChanged('" . $table . "','" . $row['uid'] . "','" . $field . "','" . $PA['itemFormElName'] . "');";
+										$PA['fieldChangeFunc']['alert'] = $alertMsgOnChange;
 						// if this is the child of an inline type and it is the field creating the label
 					if ($this->inline->isInlineChildAndLabelField($table, $field)) {
 						$inlineObjectId = implode(