Update line items value on a Workflow BP Form with Terminated status

Hello Everyone,

I have a cost workflow BP with records on a terminated status and I need to update some values. I used the record editor to update values on the upper form.

But I need to update the amount of my record. I need for this to modify the amount of my line items but I can not modify existing LI even if I "Allow modification of Line Items" on the properties of my Upper Form tagged as record editor.

Do you know if there is another way to perform my need ?

Thank you in advance.

Best regards,

Thomas