Promote to Customer not updating Open quotes for new customer number

Client is using Sage CRM 7.3 sp3 and Sage 300 2016.  They have started entering Leads for their salespeople and then adding them as a Company but not promoting them to Sage 300 at this point.  They are creating quotes for these companies which sets the customer number in Sage 300 to the CRM999999. 

When the company accepts the quote, the client is using the Promote to Customer to set the company up as a Sage 300 customer.  However, they are finding that the process is not changing any quote or order to the new customer number. 

We have tried this several times but to no avail.  Has anyone seen this before?

Thanks

Terry