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Upgrade and revert issue related to the SnapLock for SnapVault feature

When you upgrade to Data ONTAP 7.3.1, there are certain scenarios in which SnapLock for SnapVault relationship might not work.

The following table lists the scenarios you need to care of before upgrading to Data ONTAP 7.3.1:

If... Then...
The storage system for both SnapVault source and destination are on Data ONTAP 7.3.1 The SnapVault relationship between SnapLock Compliance as the source and destination is disallowed.
  The SnapVault relationship between the SnapLock Compliance volume (source) and SnapLock Enterprise volume (destination) is allowed.
The SnapVault relationship between SnapLock Compliance volume (source) and a regular volume (destination) is allowed.
The SnapVault relationship between a regular volume (source) and a SnapLock Enterprise volume (destination) is allowed.
The SnapVault relationship between regular volume to regular volume is allowed.
The SnapVault relationship between regular volume (source) and SnapLock Compliance volume (destination) is allowed.
The storage system for the SnapVault source is in Data ONTAP 7.1.3, Data ONTAP 7.2.5.1, or Data ONTAP 7.0.7 and the destination is Data ONTAP 7.3.1 The SnapVault relationship between SnapLock Compliance (source) and SnapLock Compliance (destination) is disallowed.
In this scenario, all the other SnapVault relationships are allowed between all types of volume.
The storage system for the SnapVault source is upgraded to Data ONTAP 7.3.1 and the destination is Data ONTAP 7.1.3, Data ONTAP 7.2.5.1, or Data ONTAP 7.0.7 The SnapVault relationship is allowed between all types of volumes.
The storage system for the SnapVault source and destination both are on Data ONTAP 7.2.5.1 and if you upgrade the destination to Data ONTAP 7.3.1 Ensure that the source and destination volumes are not SnapLock Compliance volumes. If the destination volume is a SnapLock Compliance volume, the snapvault update command fails.