Hi Walter,

>Are you by any chance using grids for input on this form ? Then it could be the valid code of the objects in the grid causing this problem.

Yes I do. There is a grid with a checkbox where a user can check/uncheck a record. There is some in code in the valid event, but the event occurs before the valid or click code of the checkbox is executed. I now also discovered a previous version of the program didn't have the problem. The main change was that I saved the form as class and now as this class. There were some changes in the code as well though.

What puzzles me is that the error seems to occur at the level where the form was called from. I even noticed that after ignoring the error several times, the program would say the error occured in the main module, that is three or four forms up in the calling sequence. And, the table is a local table. Yet, the error seems to occur only when several users are simultaneously using the form, but not really in a predictable manner.

I tried a whole lot of changes yesterday, like using a textbox instead of a check box, turning off code in valid events and afterrowcolchange event.
Nothing works.

Any idea?

Auke