Use of GSA Global Supply does not require a signed version of the 889. Individuals are purchasing items and are using GSA Global Supply, that portion works fine. Some of our individuals say when they are using GSA Global Supply it links them to locations such as GSA Advantage and a vendor name is applied to results of purchasing items which requires a Signed 889 from the vendor. Any suggestions on how to avoid the need for a 889 signed when linked to GSA Advantage from GSA Supply.