How to update Complex PO, where the total Advance amount is mentioned in the first line but not for

Hi Experts,

Root Cause:

1. For Complex PO, which has 2 Lines. User has Updated Advance & Recoupment for the PO Line-1 But Unfortunately he didnt mention the Advance & Recoupment for Po Line-2. With which Total Advance of 3974659.5 got applied to PO Line-1 But Advance didn't get applied to PO Line-2 which is hanging Idle in Complex PO with out advance.

2. Total Advance of 3974659.5 should have been applied Proportionately both Po Line-1 & Po Line -2 But Unfortunately Total advance got applied to PO Line-1 but not for Po Line 2 due to user mistake where he didn't enter the advance amount Proportionately for Po line -2