Thank you for your feedback. That is indeed confusing. Due to addresses in the Netherlands can sometimes include numbers in their street name, the parsing isn’t flawless at the moment. We’ve working on a more permanent solution internally.
For now, we recommend you to add a dot (.) or a dash (-) and the extra number will be correctly used as an addition.
We’ve added your feature request to retain any prefixes for additions. Currently it works correctly for the shipping process as the data is correctly passed as ‘addition’, but it looks confusing on the physical label when the dash isn’t visible, even though it was given (shows up as “1 5”). This change should show “1-5” on the label again.
Let us know if you need additional support and thanks for using our plugin.
Plugin Development Team
DHL eCommerce Netherlands