Fixed Lot Multiplier quantity in Purchasing.

Hi,

We use Oracle EBS R12.1.3

We want to force users to buy in item's fixed lot multiplier quantities. Currently Fixed lot multiplier works in planning created requisitions but we want user not to be able to change fixed lot multiplier quantity on both manually created requisitions and purchase orders.

Questions:

1. is it possible to default fixed lot multiplier quantity to Requisition and Purchase orders. (We use core purchasing only)

2. How to restrict user changing any quantity that is not a multiple of fixed lot multiplier

Please advise.

Thanks,

Ram