Importing activities together with attachments using the DTW

I would like to import activities and the corresponding attachments with the DTW, but I'm not sure how to link attachement to activities.

More specifically, I understand I've got to work with three DI objects :

• Contacts (for activities),

• Attachments2,

• and Attachments2_Lines,

but I don't understand what kind of link should exist between Contacts and Attachments2_Lines.

Do I have to import attachments first, obtain their absolute entries with a query on table ATC1 and only then import activities, referencing theses absolute entries in the "AttachmentEntry" column?

Or is there a simpler solution?