Update Email Contact not reflecting on Requires Approval POs

Hi.

1. Created a PO with email address abc@test.com and got it approved

2. Changed the supplier contact to abc_new@test.com for supplier in supplier definition

3. Changed the price on PO so that status changes to "Requires Reapproval" and then click on approve, it still shows the old email as abc@test.com instead of abc_new@test.com

However if i create new PO, it shows the new updated email address.

Please suggest.