Meaning: In the catalog, this piece of equipment is marked that it cannot be mirrored. However, the equipment has been mirrored.
Recovery:
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Set the Locate Filter to equipment.
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Select the equipment in error.
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Examine the equipment in the model. You might need to replace the equipment with another piece of equipment, or you might need to remodel some of the piping or structure to accommodate that the equipment cannot be mirrored.