@Begin(flushMode=MANUAL)

  EntityManager.clear() 

....
  <begin-conversation join="true" flush-mode="MANUAL"/>

   <action execute="#{myObjHome.wire}"/>

   <param name="myobjFrom"/>
   <param name="myobjId" value="#{myObjHome.usrsId}"/>
...

 <navigation from-action="#{myObjHome.update}">
     <rule if-outcome="updated">
       <end-conversation/>
       <redirect view-id="/prote/MyObjList.xhtml"/>
     </rule>
      
  </navigation>
...

...

 public String update() {
...
...
 try {                
	      conn = GetDbConn(); //cами берем коннекшен, а не через EM!  
              cs = conn.prepareCall("{ ? = call myStorProc( ?,?,?,?,?, ?,?,?,?,?,?, ?,?,?,? ) }");
	      this.getEntityManager().setFlushMode( FlushModeType.COMMIT ); 
	      this.getEntityManager().joinTransaction();  
  	      
	      cs.registerOutParameter(1, Types.VARCHAR);
 	      
	      cs.setLong( 2, lId );
	      cs.setString( 3, lmyObj.getLogin() );
           lRes = "updated";
 ....
catch
...
     lRes = "error";

}

 this.getEntityManager().clear();
 return lRes;
}
...

<h:commandButton id="myObjEdt"
                          value="Save (Edit)"
                         action="#{myObjHome.update}"
                     propagation="end"                         
                         view="/prote/MyObjList.xhtml"
                         rendered="#{myObjHome.managed}"
                        />