private CommandSource validateMakerCheckerTransaction(final Long makerCheckerId) {
final CommandSource commandSourceInput = this.commandSourceRepository.findOne(makerCheckerId);
if (commandSourceInput == null) { throw new CommandNotFoundException(makerCheckerId); }
if (!(commandSourceInput.isMarkedAsAwaitingApproval())) { throw new CommandNotAwaitingApprovalException(makerCheckerId); }
this.context.authenticatedUser().validateHasCheckerPermissionTo(commandSourceInput.getPermissionCode());
return commandSourceInput;
}