SAP Message AC660 - Line item schema &1 is still used in country &2

Diagnosis
Line item schema &v1& is still used in country &v2& for cross-systemdepreciation area &V3& with transaction type &v4&. Therefore, it cannotbe deleted.

System Response
Line item schema &v1& is not deleted.

Procedure
In order to be able to delete line item schema &v1&, you first have todelete its assignment to &v2&.