Basically, it is possible to create traces by doing a drag and drop from a versioned document to a live document. But it makes no sense that the drag and drop functionality is not possible from a live document to a versioned document.
Indeed, regarding our development processes (managed by airworthness norms), we shall create traces on versioned documents (versioned meaningful contents) because a versioned document is validated or approved and then, the traceability makes sense in this case. Moreover, we shall create traces from lower requirements to upper requirements ; as an example, a member of a Software team shall create traceability to the upper document (a document from the Equipment or System team). In this case, the member of the software team shall have the ability to create traces by doing a drag and drop from its software document to the versioned system document because the traceability process is a bottom-up procresses.
The Case 15136960 has been opened about this topic and we strongly need this functionality.