Unpurchasable item appear in iProc requisition page and also added to Cart

HI

under item definition, user has unchecked the Purcasable flag and expect that apart from Purchase Order in PO module there should not be any requisition should be created for this item in iProc.

When iProc user open requisition, user can able to search this item and able to add in cart also. though he not able to submit the requisition but expectation is that error should appear either on search itself or when adding in cart.

we do not use iproc for IR. We use oracle purchasing requisition form to raise IR. Item is not purchasable but Internally orderable flag is Yes.