Hi Manas,
The t.code.F.19 is used to know the goods delivered but not yet invoiced list and invoices received but goods not delivered list at the specific date.
F.19 is regrouping of GR/IR balances and F.13 is used for automatic clearing of GL,Vendor & Customer balances based on certain criteria maintained in OB74. Both serves the different purpose.
Regards,
Mukthar