Comment 3 for bug 1109131

To make this clear: since most MySQL collations (including TYPO3's default collation "utf8_general_ci") are case-insensitive, I assume this isn't simply done by removing "uniqueInPid" from flexform configuration as this will likely lead to unpredictable results when selecting those records from database.

Could you please do some testing on this issue? Just remove "uniqueInPid" as eval-function from the field configuration in tca.php and you are ready to go!