Query script generation failed. See your BusinessObjects administrator. {0} (WIS 00013) Member Selection and Prompt answers for Characteristic 'xxx' cannot be translated in a BICS compatible command. (WIS 00000)

I have a very strange error within Business Objects 4.0 SP7 Web Intelligence Web Client; rebort based on Bex Query BW 7.3

Query script generation failed. See your BusinessObjects administrator. {0} (WIS
00013) Member Selection and Prompt answers for Characteristic 'xxx' cannot be translated in a BICS compatible command. (WIS
00000)

This error appears when trying to use a Bex hierarchy with not assigned values and running the query panel. Deleting these value in the BW database is not the right solution because there can be everyday new not assiged values.

Very strange behaivor is also that when we copied the existing Bex hierarchie and use the copied version hierarchy on a cube with unassigned values it works.

Does anybody know this behaviour?

Thank you very much for your support

Michael Wecker