Receivable update process not populating data in PS_ITEM table

HI ,

I created a new Accounts Receivable Business Unit. I created a pending item and created accounting entries. Data was populated in

PS_GROUP_CONTROL

PS_PENDING_ITEM

PS_PENDING_DST tables. But when I ran Receivable update process, it did not populate data in  PS_item table and PS_item_dst table.

Please help as I might have missed something in  setting up the new AR BU.

Thanks

Sudarsan