How to find the parent node of a BP assigned in PPOMA

Hello everyone.

I'm sorry to have to ask this question as I'm sure it's a pretty basic one, but I am stuck.

I am writing an ABAP code where I need to read the attributes of the parent of a BP that is assigned in the Org Model.

I have the BP Number, but have to idea how to get the parent node.

Example:

In red the BP with its number that I already have in my ABAP code. In yellow the node of which I need to read the attributes.

I found the FUBA RH_OM_ATTRIBUTES_READ_PARENT which seemed perfect, sadly it doesn't seem to be working with BP numbers...

Any ideas as to how I can find this?

Thank you very much in advance!

Greetings,

Nick