asp.net web api - UpdateRelatedObject method only works when the sourceProperty is not collection -

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i getting following error when try update tree of object using asp.net webapi odata:

"updaterelatedobject method works when sourceproperty not collection."

my code provided below. got error when mehod "updaterelatedobject" called. can please advise wrong code , how update tree of objects (meaning object contains collection of child objects) using asp.net webapi odata v4.

var container = new container(new uri("http://johnalbert.com/myodatatest/odata"));             product product = container.products.expand(p=> p.productitems).expand(p=>p.productinvoices).where(p => p.pid == guid.parse("28c508b8-f2dc-45c2-b401-7f94e79ab347")).firstordefault();             if (product != null)             {                 product.name = product.name + "_modified";                  var pitem1 =  product.productitems[0];                 product.productitems.remove(pitem1);                 container.updaterelatedobject(product, "productitems", pitem1);                   var pitem2 = product.productitems[0];                 pitem2.price = 999;                 container.updaterelatedobject(product, "productitems", pitem1);                  var pinv1 = product.productinvoices[0];                 product.productinvoices.remove(pinv1);                 container.updaterelatedobject(product, "productinvoices", pinv1);              }             container.updateobject(product);              container.savechanges(savechangesoptions.batchwithsinglechangeset);

what want delete relationship between items in collection-valued navigation property of entity , itself. in such case deletelink() right method use. in case following code should work:

if (product != null)         {             var pitem1 =  product.productitems[0];             var pitem2 = product.productitems[0];             var pinv1 = product.productinvoices[0];              container.deletelink(product, "productitems", pitem1);             container.deletelink(product, "productitems", pitem2);             container.deletelink(product, "productinvoices", pinv1);              container.savechanges();         }

you may think above way isn't intuitive directly removing navigation items entity using .remove() did. problem, entity tracking enabled using dataservicecollection<t> can help. can use blog post tutorial how use dataservicecollection<t>: http://blogs.msdn.com/b/odatateam/archive/2014/04/10/client-property-tracking-for-patch.aspx


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