The call should have two parameters, from and to (both with site and title)
If from exists and to exists:

• if item(from) = item(to) : do nothing else raise error

If from exists and to not exists:

• setsitelink(from,to)

If from not exists and to exists:

• setsitelink(to,from)

If from not exists and to not exists:

• id = createitem
• setsitelink(id, from)
• setsitelink(id, to)

Version: unspecified
Severity: enhancement
Whiteboard: storypoints: 5