Diagnosis
There is no provision for suppliers of account group ZDOM to assume the partner role 'VN'.
Procedure
Enter a different partner or mark the supplier's account group as allowed for the partner role 'VN'.
SOLUTION:
STEP 1: Follow the below Path to configure : SPRO > IMG > Materials Management > Purchasing > Partner Determination > Partner Roles > Define Permissible Partner Roles per Account Group
STEP 2 : Click on New Entries and Provide Partner Function and Account Group > SAVE.
Thanks,
Adharsh K S