R12 New Supplier creation Issues

Issue: Once a new supplier is created in R12, the supplier does not appear in the LOV while creating a PO.

Cause: Purchasing tag is not checked while creating the new supplier.

Solution:
Go to the Supplier page, Supplier Address book, Select the site and click on "Manage Sites". In the next page, make sure "Purchasing" & "payment" tabs are checked.

This should make the supplier to appear in the LOV of PO.