How to Customize the Popup Match Invoice Lines to customize the warning Message and need a log file

Summary:

Need to Customize the Pop Up in 'Match Invoice Lines'. When payment term is changed and trying to match to a PO, then customize the seeded warning Message and need a log file providing details on invoice and field level modifications done with user ID

If processor try to change the payment term at header level for both cases (PO & Non-PO), system should popup with the Custom Warning Message instead of seeded warning 'The Payment term for this Invoice differs from the Payment term on the Purchase Order ****' The Terms on the Invoice will be used'. and also provide a log file providing details on invoice and field level modifications done with user ID