Ooops, that was my mistake. In some TIB_Querys there were no KeyLinks
defined, cause I switched of the "KeyLinkAutoDefne" option in the TIB_Query
Componenteditor (what is the excact name of this editor?)

Actually I'm learning while programming and try to become familiar with
IBObjects, but sometimes the number of properties are killing me... ;-))

thanks for your patient.....