Form-subform: Cannot update field message

[raymondo]

I have a form-subform set up which is essentially enrolments for courses.
Each student may enrol in many courses.
This was working fine until I added a few fields to the subform and included a course-cost total in the subform footer. Well, it still does work, but when a new course is added, I get the message - "The field cannot be updated". It doesn't say which field and asking for help at this point brings up a blank help page (I work with a French language version of Access 2000 and there quite a few help pages missing as they haven't been translated). Anyway, does anyone have any idea what might be going on?
None of the fields on the subform are locked and all are enabled.
I would be grateful for any suggestions.
Thanks.

Raymondo

 

[Rolliee]

You need to show more code. It is hard to read minds!

 

[raymondo]

The only code attaced to the subform is an AfterUpdate event for the cost textbox that refreshes the subform so as to display the new total in the footer.
Anyway, whatever was causing the glitch disappeared after I redesigned the subform from scratch! Raymondo
raymondo@rossar.net