Error during Payment receipt - F-28

Dear Concern,

We have configured Cash discount in our system for sales.

While receiving payment from the Tcode F-28 i am getting the below error.

Tax code A0 for country IN has been deleted or incorrectly changed

Message no. FS201.

I have done all the primary level troubleshooting steps. Tax code A0 is present in Ftxp and is assigned to country IN.

Customer is an Indian customer.

Kindly suggest what can be the possible reasons for this.

Thanks & Regards

Om Prakash Gupta