AP Invoice Workflow - Reassigning noticfication

Dear Team,

AP Requester X reassign the notification after enter the account code in Accounting Distributions in View Additional Invoice Details page and then want to Return to Notification Detail to reassign the notification.But, we have noticed update did in View Additional Invoice Detain by X disappear as soon as when you returned to Return to Notification Detail page.

We want to requester X to enter the invoice accounting distribution and without approving the notification and assign to Y user for approval , whatever update did by X should remain when it reach the Y.

Please advise us how we can do without disappearing the information enter by X..