Thanks Jeff

I did keep trying and after 32 attempts, eventually found 4 good ways!  By the way, the quotes round 'true' are optional, which I predicted from the .NET documentation on DataColumn.Expression at http://msdn.microsoft.com/en-us/libra...) .  The help which refers to SQL syntax is quite wrong and has been fixed for later releases. I have spend far too many days delving into the source code to try to work out how the module actually works!

I have also raised incorrect documentation of the Original and Value columns for True/False columns in Issue Tracker.

Thanks again, Richard

In the Filter box add Actif_UDT_Original='true' if tou want to filter by True Valuees or Actif_UDT_Original='false' if you want to filter by false values.

Hope it helps

Best regards