Vendor Self-service portal and Vendor collaboration in Dynamics 365 For Operations

Hello,

I have setup the Vendor Collaboration in D365 and done the following actions;

1. Contoso Purchasing Clerk created a PO and sent for the Vendor review - so the PO is now on 'External Review' status

2. Vendor Contact accepted the PO 

3. Purchasing clerk now needs to accept and confirm the PO

But only the POs with 'Unanswered' Response status would be available for Purchasing clerk to accepet/ Reject.

anything that has been accepted by Vendor contact are not listed for the Purchasing Clerk to Accept/ Reject and confirm.

What set up am I missing here?

Ps: for Purchase Clerk to review the responses from Vendor Contact I tried two ways.

1. Vendor Collaboration Module > Purchase Orders > Purchase Orders for Review 

2. Go to the PO in question > Go to Vendor Collaboration section in Action Pane at the top > Click View response on latest sent orders etc.

Thanks!

Loku