Major Description
It generates invalid XCASes as output if you try to do this. This is because Sofa mapping is used to do XML detagging, but Sofa mapping isn't implemented correctly for Vinci services (in fact it seems completely broken now). Anyway it is slated to be completely removed for v2.1 (see UIMA-122).
It may be possible to do Sofa mapping differently so that the detagged text is stored in the _InitialView, so that Sofa mapping isn't needed for the remote. Failing that, we'd just need to put in a better error message until such time as we implement Sofa mapping for remotes in a reliable way.