[Therion] joining lines - namespaces of scraps?

Hello list, when joining connecting lines connecting lines between different scraps, I realized, that their IDs must be individual, because the IDs can not be referenced by their scrap ID. I have for example line1 in scrap1 and line2 in scrap2. To join these lines I write: join line1:end line2:0 What is the best way not to use line IDs more than once in a cave project? I would prefer referencing to the scrap ID like: join scrap1.line1:end scrap2.line2:0 But this returns an error :( Do I have to add the scrap ID manually to the line ID? Any other ways to handle this? Best regards Wolfgang