Order Item based on MPQ in Sales Order

Summary:

Requirement is to have a setup in Item attributes in such a way that while entering Sales Order, the item qty is accepted only as per item MPQ.

Suppose items with suffix X, should have MPQ 3000 Qty. ie, it should be ordered in multiples of 3000.

And if any other qty is entered, order should not be allowed to submit citing a message something like "Item order qty is not as per MPQ".

We achieved this by writing groovy scripts in Order Mgt Extensions, however business wants to do it without any extensions and wants something at item level.

Please let me know if it is possible.