Because the Short Code is not a property used to create the unique ID definition, type M at the beginning of the record, and then apply the changes to the existing record. For example, the new requirement dictates that a reducing tee is placed for 4"x2" lines instead of a weldolet.
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Open the Pipe Branch Rule sheet.
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Locate the record, edit the Short Code value, and then type M at the beginning of the record.
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Bulkload the spreadsheet, and review the log file.
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Because editing the Short Code impacts the modeled objects, use the Synchronize Model with Catalog Command to mark the out-of-date objects.
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Use the Synchronize Workspace with Catalog Command to update the objects.
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Verify your changes, and resolve any discrepancies.