>>I believe I found the problem. The RowSource of the combo is a SQL of SELECT Projnum, Projdesc ....
>>
>>On a hunch I changed it to SELECT STR(Projnum,4), Projdesc ...
>>
>>I'm not sure why, but in the textbox portion of the combo it gets 'confused' when dealing with a numeric value and incremental search. The other interesting thing I found with this is that, with my change, the column that is used for the choice is a string while the ControlSource is still a numeric field. However, no problem, the selected 'number' went into the field fine.
>
>That's because you use VFP5 (i guess) with BoundTo property. In VFP3 you would get into troubles here.

I guess I was lucky the first few times while testing because this didn't fix the problem. What I ended up doing was setting the style to a DropDown Combo and in the Valid i put:

IF THIS.ListIndex=0
WAIT WINDOW "Project number entered is invalid" NOWAIT
RETURN .F.
ENDIF

This works great. However, now the value doesn't fit heightwise in the combo. I have the BorderStyle set to 0=None. Do I need to set something else? My FontSize is already at it's smallest value so that property is not an option.