Hi Siva,
Please goto SRM table BBP_PAYTERM where you can see the logical system of the payment term.
Then please check the logical system of the PO and see if they are match.
SRM doesn't save the description of payment term locally. It fetches the description from corresponding backend system.
Therefore, if the payment term logical system and PO logical system are not same, the description of payment term won't be shown.
Hope above helps.
Regards,
Stanley
