Hi ,
Can you provide more details like which scenario is implemented, SRM version etc.
Try the following and see if this helps.
a) Check if BBP_GET_STATUS_2 & CLEAN_REQREQ_UP jobs are running with out error.
b) You can debug the issue by putting a breakpoint in FM BBP_PO_LISTSEL_FOR_DESKTOP. In case of ECS scenario, try the breakpoint at FM META_PO_GETITEMS.
Regards
Venkat