Virtual links to portlet pages on PPM Gantt does not work correctly.

Document ID : KB000111850
Last Modified Date : 18/09/2018
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Create a virtual field which is linked to the user defined portlet page. 
Then this portlet page shows as pop up but in fact the window does not have the behavior.

Step to recreate.
1.Create a new link on task object which linked to a portlet page.
User-added image

User-added image

2. Show the Gantt and create a new virtual field which linked to the above link and check for "Open as Pop-up.
User-added image

3. The new virtual field is shown on Gantt List.
User-added image

4. When click the icon then I can see that the Gantt  window moves to the link page without Pop-up.
User-added image
If the virtual filed links to the existing link such as task properties then I can see that the Pop-up page opens.
This problem was reported on PPM 15.3 at this stage.
This issue will be fixed on a future version(DE42337).