code: public void setIdentifier(int identifier)
                      throws ObjectManagerException
      {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this,
                          cclass,
                          "setIdentifier",
                          new Object[] { new Integer(identifier) });
  
          // We can only set this once. 
          if (objectStoreIdentifier != IDENTIFIER_NOT_SET) {
              InvalidConditionException invalidConditionException = new InvalidConditionException(this
                                                                                                  , "objectStoreIdentifier"
                                                                                                  , Integer.toString(objectStoreIdentifier) + "not equal IDENTIFIER_NOT_SET"
                              );
              ObjectManager.ffdc.processException(this,
                                                  cclass,
                                                  "setIdentifier",
                                                  invalidConditionException,
                                                  "1:623:1.31",
                                                  new Object[] { new Integer(objectStoreIdentifier) });
              if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
                  trace.exit(this, cclass
                             , "setIdentifier"
                             , invalidConditionException
                                  );
              throw invalidConditionException;
          } // if (objectStoreIdentifier != IDENTIFIER_NOT_SET).
          objectStoreIdentifier = identifier;
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this, cclass
                         , "setIdentifier"
                              );
      }
docs: Set the identifier of the Object Store, unique within this ObjectManager.
  
  @param identifier the assigned objectStore identifier
  @throws ObjectManagerException