SoapUI testcase called from within LoadUI generates errors

when i propertytransfer the value from the soap response immediately after the soap step to a temporary variable and use that one for later steps, i won't see the 'java.util.ConcurrentModificationException: Document changed during select' any more.
But still not all my requests get deleted by the jdbc delete step

FINAL RESULTS: 00:01:00 Samples: 99 Failures: 6

too bad i can't see what the exception/fault is, loadui just shows failure, and thats it