I have been struggling with this issue for a while but I do not manage to find a clean solution for this. See also: https://forum.mendix.com/questions/8440/XML-domain-mapping-replacing-FileDocuments. In my new situation, I would like to 'store' the different datasets in the entity 'trainingsession' and link them to one of the associations coming from 'review'. I now create a variable named 'GraphSerieList' after importing but I do not seem to find a way to link this variable to the assocation so I can match it with the 'Review' entity. Domain Model: http://i59.tinypic.com/15qowgz.png Import button microflow (triggered when selecting the uploaded XML file): https://modelshare.mendix.com/models/7fb4cbbc-ba94-4d13-b2c8-93538f8d6fe4/sorting-imported-xml-files Any suggestions for improving my domain model/ microflow are welcome. Thanks