code: private void prepareForCaller(IdentifierType id, String qualifiedEntityType, String uid, String uName,
                                    boolean isIgnoreRepositoryErrors, Set<String> failureRepositoryIds) throws WIMException {
          String METHODNAME = "prepareForCaller";
          if (id != null) {
              String externalId = id.getExternalId();
  
              if (tc.isDebugEnabled()) {
                  Tr.debug(tc, METHODNAME + " prepare identifier for caller, set [uniqueId="
                               + externalId + "]");
              }
  
              if (externalId != null) {
                  id.setUniqueId(externalId);
              }
  
              id.setExternalId(null);
          }
      }
docs: prepare the identifier DataObject for caller.
  
  @param id the identifier DataObject
  @param qualifiedEntityType the qualified entity type of the identifier represented entity
  @param uid unique ID of the entity before updating operation (the should be only specified for update operation, for other operations, set the uid to null)
  @param uName unique name of the entity before updating operation (the should be only specified for update operation, for other operations, set the uName to null)
  @throws WIMException