Default PO order type before Number range assigned - BADI/Enhancement

Good day

We are currently wanting to do a validation just before the PO is sent to ECC. We are looking for an enhancement or BADI that could be used just before the number is assigned to the order. We want to velidate the order type, and the order type determines our order number range. So we need to check before the number is assigned to the PO for the XML.

Thanks

Regards

Wesley