Change payment terms for vendors

Hi all,

I would like to enquire how can I change the payment terms for a vendor if my invoice for the vendor is already posted?

I realised my invoices for some vendors have wrong payment terms and now my aging report is wrong.. 

So, is it possible to change the payment terms for an invoice if the invoice is posted?

I am using Sage 300 Standard ERP 2014.

Many thanks in advance :)

Regards,

Eunice