How to use of ”@Level0Descendants”

Regarding the use of @Level0Descendants ,

I would like to use @Level0Descendants in the POV of the allocation rule . My objective is to create a hierarchy for SG&A expenses, specify the parent value of that hierarchy as the POV, and allocate to all account values included in the SG&A expense hierarchy.

When I use @Level0Descendants , both validation and deployment are successful, but no allocation journals are posted.

However, when I specify the child members of the SG&A expense hierarchy directly, the allocation works correctly.

Could you please explain the reason for this behavior?

I appreciate your support.