message: added supplementary check on stopTransaction
diff: import { BillingDataTransactionStart, BillingDataTransactionStop } from '../../../types/Billing';
  import { ChargingProfile, ChargingProfilePurposeType } from '../../../types/ChargingProfile';
  import ChargingStation, { ChargingStationCapabilities, ChargingStationOcppParameters, ChargingStationTemplate, Connector, ConnectorCurrentLimitSource, CurrentType, OcppParameter, SiteAreaLimitSource, StaticLimitAmps, TemplateUpdate, TemplateUpdateResult } from '../../../types/ChargingStation';
  -import { OCPPAuthorizeRequestExtended, OCPPMeasurand, OCPPNormalizedMeterValue, OCPPPhase, OCPPReadingContext, OCPPStopTransactionRequestExtended, OCPPUnitOfMeasure, OCPPValueFormat } from '../../../types/ocpp/OCPPServer';
  +import { OCPPAttribute, OCPPAuthorizeRequestExtended, OCPPMeasurand, OCPPMeterValue, OCPPNormalizedMeterValue, OCPPPhase, OCPPReadingContext, OCPPStopTransactionRequestExtended, OCPPUnitOfMeasure, OCPPValueFormat } from '../../../types/ocpp/OCPPServer';
  import { OCPPChangeConfigurationCommandParam, OCPPChangeConfigurationCommandResult, OCPPChargingProfileStatus, OCPPConfigurationStatus, OCPPGetConfigurationCommandParam, OCPPGetConfigurationCommandResult, OCPPResetCommandResult, OCPPResetStatus, OCPPResetType } from '../../../types/ocpp/OCPPClient';
  import Transaction, { InactivityStatus, TransactionAction, TransactionStop } from '../../../types/Transaction';
  @@ -724,6 +724,26 @@ export default class OCPPUtils {
  attribute: Constants.OCPP_ENERGY_ACTIVE_IMPORT_REGISTER_ATTRIBUTE
  });
  // Add SignedData
  + if (Array.isArray(stopTransaction.transactionData)) {
  + for (const meterValue of stopTransaction.transactionData) {
  + for (const sampledValue of meterValue.sampledValue) {
  + if (sampledValue.format === OCPPValueFormat.SIGNED_DATA) {
  + let attribute: OCPPAttribute;
  + if (sampledValue.context === OCPPReadingContext.TRANSACTION_BEGIN) {
  + attribute = Constants.OCPP_START_SIGNED_DATA_ATTRIBUTE;
  + } else if (sampledValue.context === OCPPReadingContext.TRANSACTION_END) {
  + attribute = Constants.OCPP_STOP_SIGNED_DATA_ATTRIBUTE;
  + }
  + stopMeterValues.push({
  + id: (id++).toString(),
  + ...meterValueBasedProps,
  + value: sampledValue.value,
  + attribute: attribute
  + });
  + }
  + }
  + }
  + } else {
  if (transaction.signedData) {
  stopMeterValues.push({
  id:(id++).toString(),
  @@ -740,6 +760,7 @@ export default class OCPPUtils {
  attribute: Constants.OCPP_STOP_SIGNED_DATA_ATTRIBUTE
  });
  }
  + }
  // Add SoC
  if (transaction.currentStateOfCharge > 0) {
  stopMeterValues.push({
  