On this page, you will find more information about temporary solutions for functionalities that are not working quite right in the Collection Request service.
Multiple parcels under 1 Collection Request order should be possible again from Saturday 21 October 18:00 via DPD Shipper Central and - Webservices. DPD Shipper Local will follow later this year. Updates can be found at dpd.nl/parcelupdate.
Meanwhile, you can still have multiple parcels collected by simply creating one parcel per order. Read how to do this easily in this guide.