Sage 300 Web API Bug Report?

How do we report an issue with the Sage 300 Web API?  The POReceipts post will not store the Purchase Order number that is posted on the new Receipt.

Yet, the 'PurchaseOrderNumber' is included in the model - but the API doesn't appear to do anything with the value. 

Given how important this piece of information is to a receipt, I can only conclude that this is a major bug - and should be fixed immediately.  

The problem is made worse by the fact that the Sage UI will not allow for any updates to an existing receipt.  So we can't even manually update the receipt to add the PO number.