In formsanddocuments, xdp file not able to set relative path to read custom Lib

I am current building an application to convert xdp to pdf, 

In order to xdp to be rendered correctly, I have a custom lib which contains fragements for xdp config/ref to be used, so ultimately the xdp will become to a webform user then can fill and submit, then pdf getting generated

e.g say i have something like this http://localhost:4061/content/dam/formsanddocuments/myapplications/Customs/1.0/MyForm/MyForm.xdp/jcr:content

Then in my crx/de I have the xdp setting as:

If you look at it's usehref path, it is pointing at  ..\..\..\****** , so it is reading the render fragment from :

which does its job correctly.

BUT, if I place the common lib folder into  something like below,  

 /content/dam/formsanddocuments/myapplications/MyForm-Common/7.0

and changed the ref to "..\********" :

It stop working (not rendering xdp correctly)

As you can see already,  the same Header.xdp , node type becomes different if I place them into two places 

/content/MyForm-Common/7.0/CommonFragments/Header.xdp

vs

/content/dam/formsanddocuments/myapplications/MyForm-Common/7.0/CommonFragments/Header.xdp

When the common lib is sitting under myapplication folder, I tried  ..\  and  ..\..\ in my xdp  set for usehref, but not possible to get xdp render correctly (it seems not reading the  common lib at all as long as the common lib is sitting under /myapplication folder)

The only way I can get lib working is make it sit under /content directly, and in my xdp, usehref='..\..\..\****'. then it will work...

So the question is ,  how do I make the  usehref  pointing at a relative path to my custom lib and make the xdp render working when the lib is sitting in folder structure like 

/content/dam/formsanddocuments/myapplications/MyForm-Common/7.0/CommonFragments/Header.xdp  ?

Thanks for help