diff -ru typo3-7088/t3lib/class.t3lib_tceforms_inline.php typo3-7088-13250/t3lib/class.t3lib_tceforms_inline.php
--- typo3-7088/t3lib/class.t3lib_tceforms_inline.php	2010-03-08 13:51:35.000000000 +0100
+++ typo3-7088-13250/t3lib/class.t3lib_tceforms_inline.php	2010-03-08 13:55:17.000000000 +0100
@@ -723,6 +723,12 @@
 					$this->inlineFirstPid,
 					$comboConfig['foreign_table']
 				);
+					// set language for new records to the same as the given record
+				$relationLanguageField = $GLOBALS['TCA'][$config['foreign_table']]['ctrl']['languageField'];
+				$recordLanguageField = $GLOBALS['TCA'][$comboConfig['foreign_table']]['ctrl']['languageField'];
+				if ($rec[$relationLanguageField]>0) {
+					$comboRecord[$recordLanguageField] = $rec[$relationLanguageField];
+				}
 				$isNewRecord = true;
 			}
 
@@ -1136,8 +1142,8 @@
 				$parentRecord = $this->getRecord(0, $parent['table'], $parent['uid']);
 				$parentLanguageField = $GLOBALS['TCA'][$parent['table']]['ctrl']['languageField'];
 				$childLanguageField = $GLOBALS['TCA'][$current['table']]['ctrl']['languageField'];
-				if ($parentRecord[$languageField]>0) {
-					$record[$childLanguageField] = $parentRecord[$languageField];
+				if ($parentRecord[$parentLanguageField]>0) {
+					$record[$childLanguageField] = $parentRecord[$parentLanguageField];
 				}
 			}