Can you put up the Error message from the Console or Log messages.
The reason association is not working is, you must be calling the microflow from a null order (when the object has not been created) and hence not finding any order object to associate with from fetching the other details. When you are retrieving from database, it must be retrieving all the lines and hence your query might be working, but you must be getting incorrect results.
You share more details about from where are you calling this microflow and I can help you fix the issue
thank you for your replys.
The error log displayed nothing but only warnings. The Apps runs fine.
My ERM looks like this:
And I use a button to call the microflow and the the button is in a Data Grid.
Hopefully it’s more clear and I guess it’s a thought mistake.