Gathering WT Part Representation not derived from associated CAD Doc

I have a Gathering WT part "xx_asm" associated by owner link to a CAD doc "xx.asm" 

I read through a lot of support and community articles, tried a lot of available options but didn't find a solution. I am facing the following problems:

1. The Creo View Representation created on CAD Doc is not shown on the (Gathering) WT part.

2. When attempting to create a new representation for WT Part, the page 2 "Choose Input source" of "New Representation" dialog box  shows different options than expected. As shown in the images below...

I tried to repair the Owner Link, but no change. 

Secondly, when I add the CAD Doc "xx.asm" to a Workspace, the Related WT Part "xx_asm" is also added. It  means the owner link must be fine... but still, where is the root cause and how to solve?