help for Ms Access combo box only can be viewed by sa

I have a Ms Access interface (which is connected to a sql Server database server),

I create a new proc for one Access combo box and I used it in Access interface. It works fine if I log in as 'sa' but not other user. Other user can't see the combo box list at all.

BTW, I grant the security for the user to execute the new proc.

Please help me here!

Thanks!

Kathy