Setting a symbolic's value back to it's default value can be accomplished by deleting the symbolic override. Use the following SCL in the Endevor Batch Admin utility to delete a symbolic override:
Delete Processor Symbol
From ENV 'environment name' SYSTEM 'system name' TYPE 'type name'
STAGE ID 'stage id'
PROCESSOR GROUP 'group name'
PROCESSOR TYPE EQ (generate, move or delete)
SYMBOL EQ symbol-name More information can be found in the CA Endevor Software Change Manager SCL reference chapter 6 section entitle "Delete Processor Symbol Syntax".