I use the api/explorer to add link between artifact but I always have the following:
{ "error":
{ "code": 500, "message": "Internal Server Error: error: Nature is missing for artifact #1280.\n" }
}
Json sent :
{ "values": [
{ "field_id": 1151,
"links": [{ "id": 1280 } ] }
] }
I don't know how to add the nature to my json. I read the wiki but it seems to be incomplete. I also looking for a test in the source code without sucess.