> Then, I add it again and the fields show as tibobcdfield, but
> after close the unit of the form and re-open again, I get the
> same message of 'Class TIBOBCDField not found'.
>
> I have persistent fields on this form(and others) too.

I tried it here under BCB4 and cannot reproduce the problem. I can
only think that you may need to reinstall 3.6.D to be sure you have a
clean start.

The main time I had difficulties with the TIBOxxxField classes was
where it appeared that my complex set of inter-related packages would
confuse BCB and it would complain about the fields not being
registered. I could usually resolve this by removing packages and
readding them in order of dependancy.

HTH

Geoff Worboys
Telesis Computing