editaction is used to send the unit object and then i use it to retrieve target using my own method

translationunit controller

/**
	 * edit action
	 * @param \Somea\Translation\Domain\Model\TranslationUnit $unit An Unit to edit
         * @param \Somea\Translation\Domain\Model\TranslationPackage $package 
         * @param \Somea\Translation\Domain\Model\TranslationLanguage $language 
	 * @return void
	 */
	public function editAction(TranslationUnit $unit, TranslationPackage $package, TranslationLanguage $language) {
               
               $target= $this->translationTargetRepository->findTargetByUnitAndLanguages($unit, $language);
               $this->view->assign('title','Edit Translation Unit');
               $this->view->assign('packages', $package);
               $this->view->assign('languages', $language);
               $this->view->assign('unit', $unit);
               //$this->view->assign('target', $target);
                               
	}
        
        /**
	 * Set property mapper configuration for target creation
	 * @return void
	 */
        public function initializeUpdateAction(){
            $this->arguments['target']->getPropertyMappingConfiguration()->allowCreationForSubProperty('translationUnit');
            $this->arguments['target']->getPropertyMappingConfiguration()->allowModificationForSubProperty('translationUnit');
            
        }
        
        /**
	 * update action
	 * @param \Somea\Translation\Domain\Model\TranslationTarget $target A new unit to add
         * @param \Somea\Translation\Domain\Model\TranslationPackage $package A new Package to add
         * @param \Somea\Translation\Domain\Model\TranslationLanguage $language A new Language to add
	 * @return void
	 */
	public function updateAction(TranslationTarget $target, TranslationPackage $package, TranslationLanguage $language) {
                $this->translationTargetRepository->update($target);
                $this->redirect('index','TranslationUnit','Somea.Translation',array('language' => $language, 'package' => $package));
                
	}