LOG10 Error in Sales Quotation.

Transmission log
Partner with the partner role AP cannot be converted.

What this means is the License Recipient and Contact Person in Parties Involved are different, and SAP doesn't like it.  Sometimes they can be different, and SAP doesn't care.  But if you get this error, it means SAP doesn't like it.

Simply edit the quote by copying and pasting the contact person partner id into the name column for the license recipient.  Save the quote, the error should disappear.   Remember, you can only edit the quote in Draft status or Order Received status.  

If the quote is in Quotation Verified status, then only Daniel, Dean, Ari or Michael can change the quote status to Technical Error, fix it, and then mark the quote Order Received.

I don't know where the License Recipient comes from.  License recipient is related to software subscriptions, but software subscriptions have not been rolled out to IQS-US, so not relevant for us.