Contract vendor 105919 differs from vendor 105920

Hello All,

We got a requirement from the client

Contract xx exist with US vendor 105919,but now business wants to create PO with the xx contrat for other Kenya vendor 105920.

In order to fill the requirement, i have added kenya vendor 105920 in US vendor 105919 partner functions.

Vendor master partner functions

While creating PO with contract number system is showing two vendors, but once i select kenya vendor system is automatically picking US vendor.

when i tried to enter kenya vendor mannually system is throwing error Contract vendor 105919 differs from vendor 105920. and system is not allowing us to change vendor.

Could you please provide your inputs on where I missed settings.

Thanks,

AMD