rcpt reservation in mmbe

Dear PP Gurus,

My requirement is the user when ever creating an sto order (PO) the system needs to check the reservation and available stock, if the available sock is less than reservation the system should allow to raise sto order .

For example -

Available stock - 50

Reservation - 10 (auto reservation from production order)

STO order - 50 - 10 =40 for this 40 quantities only the system allow to raise the po (STO order)

This is working fine.

But when ever the rcpt stock is there in mmbe this calculation is not coming.

I have attached the config page for reference.