Make invoice reference not readonly for posted invoices

[pokoli (Sergi Almacellas Abellana)]

@ced

For example an employee expense.

An employee expense should not be booked using an invoice but using directly an account move.
You can have a move template for that.
Also we have Expense reimbursement. Even on the first post of this topic you say:

@ced

For me, you will not create a supplier invoice for the expenses. The expenses is enough and the invoice will not be addressed to the company otherwise it is not an employee expense but just a normal supplier invoice.

@ced

we should not make required a field that is not needed to be required by the process.

Why it is not required? When you book an invoice you must identify it, so this means including the supplier invoice number on the reference. Otherwise it is not possible to identify exactly the invoice.