bool IsHasAleady(CalcService calcService)
        {
            var orginal = calcService.GetOriginalFlight();
            var id      = calcService.Target.Id;

            if (orginal == null)
            {
                throw new InvalidPluginExecutionException("there is no Flight for Service Event");
            }
            var query = "";

            if (!_isOnCreate)
            {
                query = @"<fetch mapping='logical' version='1.0'>
		                        <entity name='new_incidentservice' >
                                    <attribute name='new_incidentserviceid' />
                                      <filter type='and'>                                                         
                                                <condition attribute='new_incidentserviceid' operator='ne' value='" + id.ToString() + @"' />
                                           </filter>
			                       <link-entity name='new_flightoccurrence' from='new_flightoccurrenceid' to='new_flight' >
                                          <filter type='and'>                                                         
                                                <condition attribute='new_flightoccurrenceid' operator='eq' value='" + orginal.Id.ToString() + @"' />
                                           </filter>
			                       </link-entity>
	                        </entity>
                        </fetch>";
            }
            else
            {
                query = @"<fetch mapping='logical' version='1.0'>
		                        <entity name='new_incidentservice' >
                                    <attribute name='new_incidentserviceid' />
			                           <link-entity name='new_flightoccurrence' from='new_flightoccurrenceid' to='new_flight' >
                                          <filter type='and'>                                                         
                                                <condition attribute='new_flightoccurrenceid' operator='eq' value='" + orginal.Id.ToString() + @"' />
                                           </filter>
			                       </link-entity>
	                        </entity>
                        </fetch>";
            }
            var compensations = calcService.Service.RetrieveMultiple(new FetchExpression(query));

            if (compensations.Entities.Count > 0)
            {
                return(true);
            }

            return(false);
        }