This applies to our local, 3.1 tamu tenant
I have been preparing for migration of existing purchase orders by creating appropriate json and submitting it to the orders/composite-orders endpoint, using the composite_purchase_order.json schema as a model. I have successfully loaded half a dozen purchase orders, all of which contain the appropriate vendor id, linking them to a vendor which has already been loaded into the 3.1 tenant.
When I bring up the pos in the ui, the vendor doesn't display. And when I select the vendor dropdown, it lists only the vendors whose names begin with a number through those whose names begin with the letters 'bookl'. I have verified that the correct vendor id is stored in the purchase_order record by doing a get for the po record on the orders-storage/purchase-orders endpoint.