A simple form presently with only 2 comboboxes.

The second is dependent on the value in the first, so with a RowSourceType of 3 (SQL) I have "...WHERE BINS = ThisForm.FirstCombo.Value ..." in the RowSource's SQL command.

Doing so results in the error message "Thisform can only be used in method" and the question is WHY?

I've found a way around but don't see why I had to lose an hour on something that looks like it shouldn't happen.

Thanks