Modify this option on DFM
dfm option set pmUseSDUCompatibleSnapshotNames=Yes
old SnapShot Name*: YYYY-MM-DD HH:MM:SS Retenetion Type
new SnapShot Name: YYYY-MM-DD HH_MM_SS Retenetion Type
* With dfm options:
pmCustomNameUseHostName No
pmCustomNameUsePrefix No
pmCustomNameUseQtreeList No
pmCustomNameUseRetentionType Yes
pmCustomNameUseType No
pmCustomNameUseVolumeName No
Regards