silverlight - WCF RIA Services deleting related data -

say have one-to-many relation between entities customer-order. if delete customer want delete related order's. if try on client side:

foreach (order order in cusomter.orders) {     context.orders.remove(order); } context.customers.remove(customer); context.submitchanges(); 

it calls customer delete domain operation on server first, fails because of relational constraint in database. how can delete orders first?

submitchanges before removing customer, , fix issue.

edit: you'll have submitchanges twice.