Transfer of Planned orders from R/3 to APO

Dear all,

I am working on an existing system where I found that planned orders are automatically transferred to APO once they are created in R/3. Which means we need not CIF them separately. However for one material this transfer is not taking place.

I am trying to find the reason of this system behaviour. It would be great if you could let me know where we do this setting of automatic transfer of planned orders from R/3 to APO and why this may happen for a particular material.

Thanks in advance!

Snigdho