Error 'PO_HEADER_ID There Should Be At Least One Line Per Document' When Importing Blanket PO (BPA)

When attempting to import the Blanket Purchase Orders (BPA), there is an error -

"Error: PO_HEADER_ID There should be at least one line per document."

Steps To Reproduce:

1. Login to the E-Business Suite - select Purchasing Super User responsibility or equivalent.
2. Load the interface tables with data
3. Execute the import blanket purchase orders concurrent program (Import Price Catalogs). The error is noted in the PO_Interface_Errors table.