Adding FOB to quote Enter

Im try to add combo box that links to FOB adabter on quotehed but getting an error message not sure im doing some thing right I have done this before with other combo boxes no problems getting a button instead of the information to populate on correctly on the quote. will add screen shot shortly.

Hi There,
You’ve probably got a solution by now. However, if not just add a combo box, put binding to UD field you’ve created. Finally, just select Erp:BO:Fob as your epiBOName or select from dropdown. The rest will fill automatically