Hi Eric again,
thank you for your advice.
I thought, maybe I could handle it without touching the code, for the tool already worked fine.

Yes, I tried it with a clean map already. But the same error message showed up. Unfortunately, I don't have VB programmer here. I myself know VBA (for Access basically), but that wouldn't help, since I don't have development environment to debug, test, compile and so on.

But thanks again
JB