Including child tesplans in a RQM report

Hi,

A simple example is that I trying to create a report where you select some Testplans and the query should also include the children of the selected Testplans.

I read in the documentation that the Child testplan relation is recorded in:
"Tesplan related Tesplan" query subject and the data item for this is External ID.

Now when I check the value in External ID it's for example a value that looks like: "b3ecec74296f4c960059f565879d51f7"

But when I then look into the Testplan query subject I can't find any ID dataitem that looks like this so what should I use to join these two querys? I'm trying to list Testplans and their related child testplans from RQM?

Thanks in advance