Use the following procedure to delete an Internal Variable.
An Internal Variable Type cannot be deleted if any Rule Templates refer to the Internal Variable.
Click Diameter > Mediation > Internal Variable.
Select the Name of the Internal Variable to be deleted.
Click Delete.
A popup window appears to confirm the delete.
Click OK or Cancel
When OK is clicked and any configured Rule Templates refer to the Internal Variable that is being deleted, the Internal Variable is not deleted and an error message appears.