anchor.diff:      return false;
     }
   
  -  createEntity({var newEnt, Map<String, dynamic> params}) async{
  +  createEntity({var newEnt, Map<String, dynamic> params: const{}}) async{
  +    if (params.isEmpty) {
  +      params = {};
  +    }
       this.statusservice.setStatusToLoading();
       if (newEnt == null) {
         newEnt = this.cEnt();
  
positive.code:     }
    }
  
    createEntity({Entity newEnt, Map<String, dynamic> params}) {
      super.createEntity(params: {'invoice': this._invoiceId});
    }
  }
  
negative.code: 
    attach();
  
    createEntity({Entity newEnt, Map<String, dynamic> params: const{}}) {
      super.createEntity(params: {'offer': this._offerId});
    }
  }
  