//================================================================================
private void validateVesselInCompanyExistance(DomainObjects.VesselInCompany vesselInCompany, Company introducer, ICompanyDomainService companyDomainService)
{
var vessels = companyDomainService.GetCompanyVessels(introducer.Id);
if (vessels.Count(v => v.Id == vesselInCompany.Id) != 1)
throw new BusinessRuleException("", "The vessel is not assigned to company.");
}
