Rate &1 has billing class &2; rate category &3 has billing class &4

What causes this issue?

Only combinations of rate category and rate with the same billing class
may be used in rate determination.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please select a suitable rate.

Error message extract from SAP system. Copyright SAP SE.