Punchout catalog not returning to SRM SC
I have a scenario where punchout catalog is not returning to SRM SC. We are in SRM 5.0 ECS on SP15. We have 2 punchout vendors. Its works fine with one vendor but does not work with other vendor.
Issue is control goes to vendor website and I can choose an item but control does not go back to SAP. On the vendor site it shows 'Sent to SAP' but control does not come back to SAP.
I debugged the BBP_CATALOG_TRANSFER BADI and control does not stop in the badi from this vendor. I used HTTP Sniffer to analyze the data sent for both POST and GET. I can see traffic for POST but nothing for GET.
suggestions are welcome.