Purchase Orders being closed when 'eorder Status' is acknowledged

Summary

Purchase Orders being closed when 'eorder Status' is acknowledged by a return file

Content

Our business has eorder configured with some BPA's where the B2B partner returns an acknowledgment file which closes the purchase order. This forces us to adopt a 2way match process, i.e. the order can not be receipted because it is closed, nor can we match the invoice to the order. 

The supplier is paid by creating a separate PAY only site where we match consolidated invoices to.  

Is there anyway to build an eorder BPA, linking it to a PURCHASING & PAY site which is 3way match, where the Purchase Order is not closed when it is acknowledged, and the invoice can be matched and the order needs to be receipted?