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AVEVA™ PI Server Installation and Configuration (PI Server 2018)

Missing mapped principal

  • Last UpdatedOct 04, 2024
  • 2 minute read

This means that the PI module specifies access for a PI identity (or user or group) that is mapped to two or more Windows accounts; and one of those principals is not on the element security in PI AF.

Cause: Either of the following conditions:

  • A PI AF element is added to PI AF with only one of those principals on the security descriptor.

  • One of those principals was removed after PI AF and PI MDB were in synchronized state.

This problem will not arise for a one-to-one mapping between a PI identity and a Windows principal unless there are some major synchronization errors between MDB and PI AF (for example, they might be out of sync already for other reasons).

Consequences: The access permissions might not be the same for PI MDB and PI AF. This could be a problem if users are trying to work with objects in both PI MDB and PI AF.

Fixes (in order of preference):

  1. Add all missing principals to the element.

  2. Remove the remaining principal(s) from the element.

  3. Edit the access permissions on the module to remove access for the PI identity. This will remove the remaining principals from element.

    Note: AF Link does not automatically pick up changes in mappings. The change does not take effect until you edit the element in some way; this triggers AF Link to update the settings in PI MDB.

This problem will not arise for a one-to-one mapping between a PI identity and a Windows principal unless there are some major synchronization errors between MDB and PI AF (for example, they might be out of sync already for other reasons).

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