XSODATA CRUD Operations (Update using not working)

this one works:

service namespace "My.Service" {   

   "Schema"."Package::Table" as "Table" keys generate local "ID"

          create using "Package::SP_MySP";

}

this one doesn't work:

service namespace "My.Service" {   

   "Schema"."Package::Table" as "Table" keys generate local "ID"

          update using "Package::SP_MySP";

}

I am getting a syntax error on the update using statement in the odata service definition.