Thank for your advise....?
I have a problem with a runtime.
In a form I valid the data when it is written down; the runtime has to see it the record that is writting down isn´t on the table.
For this I created a copy for the primary table then I selec the copy and do the runtime.
It found, so now I add a combolist, it is the last change that I have made.
What do you think about it...?
If you want and give your email, I can send you the zip file with the form.