MivaScript Builtin Function, Miva Merchant 9+
miva_struct_merge_ref( source var, dest var )
<mvt:assign name="g.return_value" value="miva_struct_merge_ref( source var, dest var )" />
Make references of the structure members from source in dest, if the member does not exist in dest. Similar to miva_struct_merge, but makes references into original structure rather than copies.