What causes this issue?

No amount authorization for customer/vendor line items has been
specified in company code &V1& for the user group to which you are
assigned.
Provided that you are not explicitly assigned to a user group, the
amount authorization to the group blank (" ") is valid.

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?

If you entered the correct company code, initiate the maintenance of
tables T043 (user groups) and/or T043T (company code authorizations).

Error message extract from SAP system. Copyright SAP SE.