Way to distinguish Min Max PO & Non Min Max PO in Approval Management

We have a business process to Route all the Min Max Requisition backed POs to a specific Approval group.

We did try to achieve the same using conditions,

Import Source Equals SCO & Document Creation Method Does not equal Generate Orders.

Since the Import Source is common for both MIN MAX and PLANNING, we filtered PLANNING using second condition.

However, now when Min Max PO are created through Negotiation, the above condition fails. As Import source is SOURCING.

Is there any other approach to identify the Min Max PO from other PO?