Entity Framework 6 - Map only one statement to Stored Procedure

This is how I'm mapping an entity to insert into a stored procedure:

modelBuilder  
  .Entity<Member>()  
  .MapToStoredProcedures(s =>  
       s.Insert(u => u.HasName("stp_insert_member")));

When I save a new member, the insert works perfectly and sends all parameters to the saved method.

But I get an exception because it's seeking for a stored procedure named "update" when I try to change a member (loading entity from database by id, altering its properties, then saving again - what will issue the update statement).Member_Update .

However, I don't want to have stored processes for that (or for remove). Just a stored procedure for the insert statement will do.

Can I link the insert action just in EF to a stored procedure?