get purch_group id from function 'BBP_PD_PO_GETDETAIL'

Hello,

i want to retrieve the purchasing group id .

For that, i am calling the function ' BBP_PD_PO_GETDETAIL' and using table result  E_ORGDATA and retrieving the purch_gp from field  PROC_GROUP_ID.

But, i noticed that sometimes table E_ORGDATA is empty.

Do anyone has an idea about the root cause of this issue?

thanks,

Meriem.