OpenAtlas

I have a drawing (SOURCE) containing the text of an inscription (SOURCE) written on a marble base (ARTIFACT). I have tried two ways of entering data: 1. I created a SOURCE entry for the drawing (https://mamems.openatlas.eu/entity/8789), entered the text of the inscription under TEXT, and linked the SOURCE entry with the ARTIFACT (the marble base). 2. I created a SOURCE entry for the inscription itself (https://mamems.openatlas.eu/entity/5736), entered the text under TEXT, and linked the SOURCE with the ARTIFACT (see attached jpeg). However, in both cases, I am losing the connection between the two sources, the drawing and the inscription. Is there a way to link them?