Minimum PO amount per Vendor

Hello,

We're using aX 2012 R3.   I'm looking for a way to specify a minimum PO amount per Vendor.  I can't find it.

This is not a product specific amount or a minimum amount for a purchase agreement with the vendor.  We're only looking to tell AX not to accept confirmation of PO below amount $X for Vendor "ABC" because this vendor will not process or accept a PO below that threshold.

Is there a place where this information can be setup?

Thanks in advance.