Change the existing text:   In some cases, the same code or identifier system might accidentally be created more than once in a registry, for example because someone failed to check for an existing entry before adding a new one or  knows the same concept with a different name.  If this occurs,  one of the system entries should be deleted and the remaining entry should have its  uniqueId  updated to include any identifiers present on the original entry  (and possibly have its descriptive information modified to include additional information from the duplicate entry). To this: In some cases, the same code or identifier system might accidentally be created more than once in a registry, for example because someone failed to check for an existing entry before adding a new one or  if they didn't recognize that their addition replicates another. If this occurs, the system publisher should be contacted for guidance.