Security Rules in iProcurement responsibility - Users should be able to submit PR with default compa

Hi Guys

I have the following requirement in iProc responsibility

1 ) Ensure users doesn’t submit Purchase Requisition with entities different from default entity(Default Company Code(Segment1) from Employee). Can this be achieved using Security Rules in the iProc responsibility ? When the users try to submit the PR with an entity other than the default entity, it should throw an error....I checked the Security rules screen... but in that i could see only Include and Exclude elements , I want users to be restricted with only default entity while submitting the Purchase Requisition. If anyone has an idea , please write to me in detail the solution ...?