>WhereType=1 means that only key field (primary key?) change may stop tableupdate. It's another story that doing this way you may overwrite first grid record change by second grid record.

>Is it really necessary for you to make changes directly in grids?

Thay's what I undestood. It is not me that is writing the program, really. It's one customer using my tools. I tried, at beginning of the database design, to get them to find a more rational way of designing the table, like splitting it in 3 or 3 parts. Their experience is all in Clipper and find very difficult to work with nothing but plain tables. I know, the design is flawed but I have not been able to convince them. I suppose that I can make read only as much as possible that is common and hope for the best.

Thanks a lot again. I never thought at the WherType property.