private bool HasManagerChangeManagerPermission(Common.Models.ManagerServiceSupplierRelation managerRelation)
 => (managerRelation.ManagerPermissions & Common.Models.Enums.ManagerPermissions.ChangeManagerPermissions) == Common.Models.Enums.ManagerPermissions.ChangeManagerPermissions;
 private bool HasManagerModifyServiceSupplier(Common.Models.ManagerServiceSupplierRelation managerRelation)
 => managerRelation.IsMaster;
 private Common.Models.ManagerContext CollectManagerContext(Common.Models.Manager manager, Common.Models.ManagerServiceSupplierRelation managerRelation)
 => new Common.Models.ManagerContext
 {
     Id                 = manager.Id,
     FirstName          = manager.FirstName,
     LastName           = manager.LastName,
     Title              = manager.Title,
     Position           = manager.Position,
     Email              = manager.Email,
     Phone              = manager.Phone,
     Fax                = manager.Fax,
     ServiceSupplierId  = managerRelation.ServiceSupplierId,
     ManagerPermissions = managerRelation.ManagerPermissions,
     IsMaster           = managerRelation.IsMaster
 };