What are the valid values for ID= in TSSMAINS JCL

Document ID : KB000120691
Last Modified Date : 10/11/2018
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for TSSMAINS job if you dont specify PRIMARY or BACKUP for the ID= input keyword. 

The documentation doesnt indicate that PRIMARY or BACKUP mandatory.
PRIMARY or BACKUP are the only values that can be specified for the ID= keyword.

The documentation will be updated to reflect this at a future date.