Hi Matthew,

>Are you sure the datetime field is the problem? You tested this control source >with a textbox, but have you tested changing the control source for this >column in the grid to something else. If the problem persists, it could be >another column.



Originally the grid was a two column grid without a datetime field and it worked perfectly. When I added the column with the datetime source I started getting the 'Invalid ControlSource' message. I took the datetime column away, no error. I added it back, error. So, then I changed the grid to a one column grid and only put in the datetime column. I recieved the error. I took the column away, I got no error. I'm pretty sure I've approached it from every angle, but I have been working on this particular problem for a while, so maybe I'm missing the forest for the trees.

Also, I approached it this way: I added a expression to my view that converted the datetime value to the date portion only, and removed the datetime field. When I specify that as the ControlSource, it works. The problem is that I don't think you can mark that as updateable in the view. So I chose not to do it that way.

Would it help if I just added an instance of a normal text box to the grid column instead of the default gridtextbox control?

TIA,

Brian