Profile Option "PO_ELECTRONIC_COMM_DATA_MODEL = NO " is delaying the Purchase Order approval

Summary

Profile Option "PO_ELECTRONIC_COMM_DATA_MODEL = NO " is delaying the Purchase Order approval

Content

We have configured profile option "PO_ELECTRONIC_COMM_DATA_MODEL = No" in order to get the PO xml’s flow through to CMK( Collaboration Messaging Framework) for EDI transaction. We are calling OIC integration for PO outbound which will generate xml file on FTP.
However, PO created for the supplier for which communication method = Collaboration Message and Purchase order created for the same supplier is delaying the PO approval. 

It take hours together for PO approval and Purchase order will be in Pending approval Status.