>OK Crescencio
>I have the comboboxes inside the grid.
>
>For each combobox:
>
>The first one
>rowsourcetype=6 (Fields)
>rowsource=tipimp.codimp,desimp
>
>The second one
>rowsourcetype=6 (Fields)
>rowsource=aimtabd1.aimtcod1,aimtdes1
>
>The third one
>rowsourcetype=6 (Fields)
>rowsource=aimtabd2.aimptas3

So the filtering is working, but the values selected disappear when you move to the next record in the grid?

What's the bound column for the combobox, and what's the grid's column bound to?

If the filter is working but the values aren't being kept by the grid's bound table/alias, then probably the combobox value is not being saved to the grid's master table.