Diagnosis
The purchasing organization you entered has not been defined for this supplier.
Procedure
If the purchasing organization entered is correct, for purchasing organization ADD1 you must create supplier master record 5000.
SOLUTION:
STEP 1: Go to Transaction Code BP, Select By: Supplier Number and Provide/Select your Supplier number and start.
STEP 2: Click on Edit mode > Select BP Role FLVN01(Supplier) > then click on Purchasing data
STEP 3: Enter Purchase Organization ADD1 and SAVE.
Thanks,
Adharsh K S