Diagnosis

System Response
If requirements have already been created with this requirements type,then these are still treated according to the previous requirementsclass.
New requirements that are created are consumed according to the newrequirements class.

Procedure
To guarantee a clear interpretation of demand management data, proceedas follows:
if requirements already exist with this requirements type, therequirements type should not be changed, but a new requirements typeshould be created with the new requirements class.