Why is a Vendor not available in the dropdown when creating a PBI?

A Vendor will be available for a Purchase by Invoice when the 'Allow PBI' box in the Vendor Details screen is checked (Enterprise Manager >Purchasing > Vendors).

The list of vendors available for a location will be limited to specific Vendors if the following is true (Corporate > Locations > PBI Vendors): 

1. The vendor has been selected as a 'PBI Vendor' in the Location Details screen. 
2. The 'Show All Active PBI Vendors' checkbox on the PBI Vendors tab is NOT checked. 

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