You cannot maintain sales-specific taxes here

What causes this issue?

You wanted to maintain sales-specific taxes. However, this is not
possible in the following cases:
If you have not selected a view for the user department <LS>Sales</>
If you have not specified a sales organization

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?

Check and extend your data as required.

Error message extract from SAP system. Copyright SAP SE.