Attribute not supported by the current UiNode in Java application


We’re having a Java application where we are trying to use activity “Select Item” to select the correct item from a drop down list. We’ve seen some similar topics out there but none were resolved in a proper way. We have no problem setting up the activity. The error comes when we run or debug.
UiPath Version 2019.10.3 - Latest Java version. Java Extension is enabled.

The selector:

The error message:
Select Item ‘combo box Instrument:’: Attribute not supported by the current UiNode.

The properties are attached.Screenshot 2020-02-18 at 08.51.09

Thankful for any help!

The selector:

 <wnd app='jp2launcher.exe' cls='SunAwtFrame' title='Finance*' />
    <java name='CHECKACC - Current Accounts' role='internal frame' />
    <java name='Instrument:' role='combo box' />

Hi @RayJay, problem is not with the activity selectors.
check whether you have used attach window and check attach window selectors are correct.

let me know if you further help.

I have used the attach window activity and added the select activity again. Same result.