|One of the partner function type VN was grey and user
cannot change it.
This is controlled from the SAP configuration tcode SPRO and can be changed accordingly.
XK02 data is grey and no change can be done.
To change the configuration settings.
IMG - Materials Management -> Purchasing -> Partner Determination -> Partner Settings in Vendor Master Record -> Define Partner Schemas (here select the line item on the right and click Partner Functions in Procedure)
Untick the No Change and save it.
Re-enter the tcode and you now be able to change it.
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