No tax information exists for billing document

Hi,

We are using CRM billing in our CRM 7.0 system. We have configured TTE for calculating tax conditions.

There is an issue with one of the billing document which is displaying an error as "No tax information exists for billing document XXXXXXX-0000000010, condition type MWST."

In the billing document Status tab the AC Transfer status is showing "A Other Errors"

How can I find the cause of this error? Any suggestions?

Regards,

PP