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Revert from 9.13.1 fails with excessive vreport entries

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ontap-9
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Applies to

ONTAP 9

Issue

Attempting a revert from ONTAP 9.13.1P2 to 9.10.1 fails as seen:
 
cluster_CLI::*> system node revert-to -node node_01 -check-only true true -version 9.13

Performing revert checks                                                                                                                              
Checking for default images                                                                                                                           
Checking for missing volumes/aggregates                                                                                                                                                                                                     
Checking for missing volumes/aggregates........                                                                                                       
Checking for missing volumes/aggregates.........          

Error: command failed: The revert check phase failed. The following issues must be resolved before revert can be completed. The Volume Location
       Database (VLDB) is inconsistent with WAFL information. Contact support personnel to resolve this issue.

 
The vreport shows an entry typical of

cluster_CLI::*> debug vreport show
aggregate Differences:

Name             Reason   Attributes
--------         -------  ---------------------------------------------------
aggr1        Present both in VLDB and WAFL with differences
                          Node Name: node-01
                          Aggregate UUID: dd02bad5-b444-4810-9999-22b5f71ca668
                          Aggregate State: online
                          Aggregate Raid Status: raid_dp
                          Aggregate HA Policy: sfo
                          Is Aggregate Root: false
                          Is Composite Aggregate: false
  Differing Attribute: Volume Count (Try to fix volume differences using vreport for volume, and check again.)
    WAFL Value: 740
    VLDB Value: 739

for every single volume in the cluster.
 
The vreport can be cleaned up, but each time the revert is re-run, then same issue occurs.
 

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