Add all attributes to 'membersToKeep' or leave it empty.
Remove the module from the assocations 'Vergaderingen_Vergaderingsoort'
Exclude the full qualified entities 'module.Documenten'
Edit: create a new 'vergaderingen' and pass it as target
BTW: I would recommend to clone the structure yourself in a microflow using clone per entity.
I followed the advice of Chris and cloned the structure myself in a microflow using clone per entity .
This works good. It is still strange why the 'Deepclone' function does not work in my model.