Cannot Change The Calculate Tax Option From No To Yes At supplier level

When I tried to change the calculate tax option at supplier site level the system shows the following error message:

Message not found. Application:ZX, Message name: ZX_REG_NUM_MUST_BE_NUMERIC

i use the following navigation to change the tax applicability:

Suppliers:
Payables (Responsibility) -> Suppliers -> Inquiry -> Query for the Supplier -> Tax and Reporting -> In 'Transaction Tax' region, update 'Allow Tax Applicability' -> Save.

Supplier Sites:
Payables (Responsibility) -> Suppliers -> Inquiry -> Query for the Supplier -> Tax and Reporting -> In 'Supplier Site' region, query for the desired Supplier Site -> Click on 'Update Transaction Tax' -> Update 'Calculate Tax' drop-down -> Save.