Hi vanmad,
Would it help to see how other systems integrate with DNG for the same scenario?
See for example, the user guide of the “OSLC Conect to Windchill”. (I refer to that, since I recently read it, and noticed the content relating to Configurations that you seem to have problems with).
https://help.sodius.cloud/help/topic/com.sodius.windchill.server.oslc.doc/html/addWindchillPartOslcLink.html?cp=14_3_2_1 shows the process of accessing a delegated UI towards DNG.
I wonder if your issue is related to points 5 & 6 in the instructions, which related to Global Configuration information (Are you handling configurations properly?) See the link on how to “Add a Configuration Association to the Part Widget.”
Worth also looking at the “admininstration guide”, to make sure you have configured DNG as expected.
I have not developed against DNG, so cannot help with more direct tips.
Jad