If you are looking at controlling your AP invoices then using matching is a good option to validate the invoices against what you where expecting from the purchase order (two-way) or combined with the receipt (3-way). You can do both in AX and there are quite a few different parameters and policies that control the outcome of the matching. The first parameter you will want to enabled is the enable invoice matching validation which you can find on the accounts payable parameters form.

Here is a quick overview.

AX2012 R3 CU11

Cheers

Lachlan