Hello everyone,
That is not what I thought, but still thank you for the answers.

I have a populated lookupcombo on form selecting different products
for a report. The user can select one of the through the lookupcombo.

In the possible selection I would like to add an item to the
lookupcombo (at the beginning) with text:("0" for column ID and "all
products" for column PRODUCTS).
Then I would check the if the ID=0 and then make a sql without a
where clause.

How can I do that?

Thanks, Marko