SAP Message QS175 - Inspection method & & & cannot be deleted DOCUMENTATION DiagnosisTo avoid inconsistencies, you cannot delete the inspection method forthe following reasons:The master inspection characteristic is referenced in a task list, andthe inspection method you want to delete was copied to the task listwhen you made the reference.You are carrying out the change without history.ProcedureIf you want to delete the inspection method, you can opt for one of thefollowing possibilities:Delete the reference to the master inspection characteristic in thetask lists.Carry out the change with history.