Custom Analytical Queries / CDS - Deriviation Functions

Hi,

im trying to recognize the conception of deriviation functions successful the discourse of customized analytical queries and cds views. 

As shown below, one privation to make a elemental Derviation Function for the tract DeriviationPlaneType

I proceeded arsenic follows (i tried to usage the deriviation for CostCenter (ZF_MYCOSTCENTER) arsenic an template):
1. My Base CDS Entity

2. My Deriviation CDS-Entity, my extremity is to lone person planetypes with the worth '747-400'

3. My Primary Data Source, arsenic acold arsenic one understand, one request to subordinate the cds-entity which contains the tract with the deriviation relation (ZI_PLANETYPE -> ZF_MYPLANETYPE-> DeriviationPlaneType)

4. Custom CDS-View

5. Custom Analytical Query

I've created a customized analytical query based connected the beforementioned customized cds-view.

But my Deriviation Function is not showing up

Did one miss anything?

I besides tried to conscionable transcript F_MYCOSTCENTER

and creating a elemental Cube

But one americium getting an mistake connection erstwhile utilizing this cube successful a customized analytica query erstwhile selecting my deriviation function.

I anticipation anyone tin assistance maine to hole this and to get an amended knowing however deriviation relation work.

best regards

Jonas