Tax Adjustment in Purchase Orders in Ax 2009

Hello Dynamic Users,

In my Accounts payable > Purchase orders, I have to adjust tax amount [ Adjusted amount in total ] for one of my Purchase Order before invoicing the Purchase Order. Am able to adjust the tax amount for other Purchase orders, but only for one Purchase order I could not adjust the Tax Amount.

I have to show the same value in Purchase Orders Form > Setup [Menu Item Button] > Tax , Adjusted amount in Total to the tax value adjusted.

Can anyone please suggest me what is wrong with the purchase order?

Thank you, Have a Good Day!!!

Regards,

Rakesh