Tax not calculating on Payment Request for Corporate Credit Card Issuer

Dear Colleagues,

Program - Create Corporate Card Issuer Payment Requests.

Above process creates, Payment request for the Corporate Credit Card Issuer.

Although the lines have the right tax codes defaulted, payment request validated, tax is not getting calculated.

Because of this there is a difference in the Expense Accrual Account.

Please can you help, why tax is not getting calculated on the payment request.

Thanks.