SAP Message WV037 - Material &1 is not procured from vendor &2

Diagnosis
Source determination did not identify the specified vendor as a validsource of supply for material &V1&.

System Response
A price could not be calculated for the material selected.

Procedure
Try again, this time without entering a vendor. The system will thenuse source determination to find all valid vendors.
To find out why the vendor you selected is not a valid source ofsupply, please check the purchasing info records for the material. Youcould also check the source of supply defined for the material in thematerial master.