1.7e formats the file itself. The code was checked for compatibility on all operating systems to which I have access and there was no problem. I have no MVS account so I couldn't check it for MVS. Anyway I would need more information to know what exactly TSO is complaining about. There are dozens of MVS fields in Netdata headers whose description in the official documentation of Netdata for VM is at best unclear and at most 2 lines, I have tried to use the same values as DMSDDL but there may be other problems - for instance, the list of required fields in the manual might be incomplete. Eric