code: public void setSecurityContext(final SecurityContext sc) {
  
  		if (securityContext == null) {
  
  			if (sc.isSuperUserSecurityContext() == Boolean.FALSE) {
  
  				securityContext = sc;
  			}
  		}
  	}
docs: Allow setting the securityContext if it was null.
  Important for Login transactions.
  @param sc