Index: t3lib/class.t3lib_tceforms.php
===================================================================
--- t3lib/class.t3lib_tceforms.php	(revision 8536)
+++ t3lib/class.t3lib_tceforms.php	(working copy)
@@ -1579,8 +1579,8 @@
 		$inlineParent = $this->inline->getStructureLevel(-1);
 		if(is_array($inlineParent) && $inlineParent['uid']) {
 			if ($inlineParent['config']['foreign_table'] == $table && $inlineParent['config']['foreign_unique'] == $field) {
-				$uniqueIds = $this->inline->inlineData['unique'][$this->inline->inlineNames['object'].'['.$table.']']['used'];
-				$PA['fieldChangeFunc']['inlineUnique'] = "inline.updateUnique(this,'".$this->inline->inlineNames['object'].'['.$table."]','".$this->inline->inlineNames['form']."','".$row['uid']."');";
+				$uniqueIds = $this->inline->inlineData['unique'][$this->inline->inlineNames['object'].'-'.$table]['used'];
+				$PA['fieldChangeFunc']['inlineUnique'] = "inline.updateUnique(this,'".$this->inline->inlineNames['object'].'-'.$table."','".$this->inline->inlineNames['form']."','".$row['uid']."');";
 			}
 				// hide uid of parent record for symmetric relations
 			if ($inlineParent['config']['foreign_table'] == $table && ($inlineParent['config']['foreign_field'] == $field || $inlineParent['config']['symmetric_field'] == $field)) {
@@ -3643,7 +3643,7 @@
 				$inlineParent = $this->inline->getStructureLevel(-1);
 				if(is_array($inlineParent) && $inlineParent['uid']) {
 					if ($inlineParent['config']['foreign_table'] == $table && $inlineParent['config']['foreign_unique'] == $field) {
-						$objectPrefix = $this->inline->inlineNames['object'].'['.$table.']';
+						$objectPrefix = $this->inline->inlineNames['object'].'-'.$table;
 						$aOnClickInline = $objectPrefix.'|inline.checkUniqueElement|inline.setUniqueElement';
 						$rOnClickInline = 'inline.revertUnique(\''.$objectPrefix.'\',null,\''.$uid.'\');';
 					}
Index: t3lib/jsfunc.inline.js
===================================================================
--- t3lib/jsfunc.inline.js	(revision 8536)
+++ t3lib/jsfunc.inline.js	(working copy)
@@ -330,18 +330,18 @@
 				if (!(unique.selector && unique.max == -1)) {
 					var formName = this.prependFormFieldNames+this.parseObjectId('parts', objectId, 3, 1, true);
 
-					var fieldObj = document.getElementsByName(elName);
+					var selector = $(objectId+'_selector');
 					var values = $H(unique.used).values();
 
-					if (fieldObj.length) {
+					if (selector) {
 							// remove all items from the new select-item which are already used in other children
-						for (var i=0; i<values.length; i++) this.removeSelectOption(fieldObj[0], values[i]);
+						for (var i=0; i<values.length; i++) this.removeSelectOption(selector, values[i]);
 							// set the selected item automatically to the first of the remaining items if no selector is used
 						if (!unique.selector) {
-							selectedValue = fieldObj[0].options[0].value;
-							fieldObj[0].options[0].selected = true;
-							this.updateUnique(fieldObj[0], objectId, formName, recordUid);
-							this.handleChangedField(fieldObj[0], objectId+'['+recordUid+']');
+							selectedValue = selector.options[0].value;
+							selector.options[0].selected = true;
+							this.updateUnique(selector, objectId, formName, recordUid);
+							this.handleChangedField(selector, objectId+'['+recordUid+']');
 						}
 						if (typeof this.data.unique[objectId].used.length != 'undefined') {
 							this.data.unique[objectId].used = {};