Unable to set Retention times in Manage subscription tile in SAP DMC

Hello experts ,

I am trying to set create a new subscription on OPC tags though SAP DMC "Manage Automatic Trigger" application but its not allowing me to set "Minimum Retention Time (Seconds)".I have already created all equipment hierarchy and connectivity to OPC tags.

Any helps or hints is really appreciated .

I have also referred SAP Documentation on the same but it doesn't work

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