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Altering User-Defined Sharing Permissions for Dynamics CRM Charts Directly in the Database

Today I received an email from a user experiencing difficulty editing charts that had been shared with them by another user, who had forgotten to check the "Write" permission. Unfortunately this person was away for the day, and for some reason CRM doesn't have a neat admin tool for managing individual user-specified sharing settings for charts and such.  So I had little choice but to dig into the bowels of the database and set the permissions manually.

User-designed charts are accessible via the UserQueryVisualization view and the actual permission info is stored in PrincipalObjectAccess table. The corresponding record for a specific user/chart can be obtained like this:

SELECT  poa.PrincipalObjectAccessId
FROM    UserQueryVisualization uq
      LEFT JOIN PrincipalObjectAccess poa
            ON poa.ObjectId = uq.UserQueryVisualizationId
                  LEFT JOIN SystemUserPrincipals sp
                        ON sp.PrincipalId = poa.PrincipalId
                              LEFT JOIN FilteredSystemUser su
                                    ON su.systemuserid = sp.SystemUserId
WHERE   uq.name = 'Chart Name'
AND     su.fullname = 'User Name'

From there all that needs to happen is to update AccessRightsMask = 786455 for that PrincipalObjectAccess record. I have no idea what this value represents but it's the same value that was set on a test record which I had assigned full access to. If anyone can explain its meaning, that would be enlightening.

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