The following tutorials guide you How to Assign Country to Calculation Procedure in SAP step by step
IMG Path :- SPRO > IMG > Financial Accounting > Financial Accounting Global Settings > Tax on Sales/Purchases > Basic Settings > Assign Country to Calculation Procedure
Transaction code :- OBBG
After defining Calculation Procedure, next step assigning country to calculation procedure
>> Select position and update country key
Update tax procedure key in the procedure field and press enter
Click on the save icon to save the data, successfully country assigned to calculation procedure.