Why do I have a supplier in my consignments called Invalid?

[M1EnterpriseTech]

I am looking at my Consignments Sold in the Purchases module and there is Supplier named "Invalid"...why?

Parts will go to the "Invalid" Supplier if the Supplier was edited later, or if there was no Supplier to start with. Also, if the consignment came from an Enterprise Legacy conversion, the consignment batch is imported but there is no associated Consignment Slip as that was not a feature in the Legacy version of Enterprise, so it will go to the supplier " Invalid".