I have a problem. If a user changes his data in user profile from invoicing or where i decide to put the data all the invoices are changed.
That is not ok.
An invoice shouldnt act like this . It must keep the original data even the user changes some data.

A field for transaction date... paid date possible?

even the invoice is paid in the same date when created

i understand that is not possible imediately .... i just observed that the data is changing in past invoices.

as i can see "due date" is the same with created date.. i cant realy understand how to use it

about transaction date
for example .. a user has an order and he will pay it offline .... at the bank today
he will send me the proof via email email next day and i will manually set the order as paid and will became an invoice created at the data when i do this action.
so .. i ask if it is possible to have a field with the date when the user paid .. in this case manually selected. because invoice date is not the same with pay date.

or even he will pay with paypal in the same day of the order is created. one is the invoice data ...when created and another is the transaction date..even is the same and looks non sense in accounting an invoice has the data when was created and the transaction date.
for example in my country you have to put the transaction date on the invoice because the user pays the money using that order - pre invoice.
for me is no problem because i have to put it manualy anyway ..i will put in notes for example
was a suggestion