Opening Balance Adjustment in nav 6.0sp1 IN

arul

See initially i have done with the Opening balance against Vendor.
The payment is also done .
But at last my client says ,the Opg Bal which i given is Wrong .
Now i want to change the figure of the Opg balance.

For Example:
Opg Bal for Vendor X-36000

Invoice 1 Opening bal is 10000
Invoice 2 Opening Bal is 10000
Invoice 3 Opening bal is 16000

So Three payment is done against for those invoices,

Pmnt 1:10000 rs Completely Done
Pmnt 2:10000 rs Completely Done
Pmnt 3:80000 rs Partially Done

Now balance is 8000 rs for that vendor.

after reconciliation my client says opening balance figure was wrong due to wrong figure in Invoice 1 and Invoice 2.

Actual Opening bal for that vendor is 30000 rs
But it was given as 36000 rs

How to configure this in Nav6.0 SP1