Network order status

Hi,

Using CN22 transaction, I am setting a network order to closed status.How do I check programmatically the same thing. That is if I have a

network order no. how do I know if it is closed or not. In which table this entry is maintained. I have checked in table AUFK, there is one field name 'PHAS3' closed. But when I change the network order to closed,

those changes are not getting reflecting in this field entry.

Thanks & Regards,

Vishnu Priya.