CK11N - Material with only activities.

Hello experts! i have a doubt regarding CK11N for a specific (and very particular) SF material.

We have a BOM with only non-valuated items. The cost of this BOM in CK11N is zero and it´s correct.

We have a Recipe with labour and energy activity types. The cost of this Recipe in CK11N is 40 USD and it´s correct.

The issue starts in CK24: The system shows planned price zero (and not 40 USD) and the price is not updated in the material (we don´t have any error in the process). So i´m wondering if this is the standard behaviour of the system: is it possible calculate the standard cost for a SF material with only activity prices?

Thanks in advance!