Good evening

I have the following problem:
When I try to program a tool with an offset of -6,20 mm on a SF20 R5, then Tebis always gives the following message: ’ Offset component part surface invalid’

Even if I give attributes to the surfaces, the same message comes up.
When I build a SF20 R6,3 or take a SF32 R8, then the whole programming works.

Can anybody help me out?

Many thanks in advance

Regards
-domme-