Sequence series for corrections

[christian-eriksson]

Some countries require corrective invoices and/or transactions to have their own sequential series (and often unbroken series, at least per period).

example

The suggestion here is to allow users to configure that corrective invoices and transactions have their own respective sequence series (i.e. one for invoices and one for transactions).

If users choose to activate the feature, corrective invoices and corrective transactions would booked under the configured sequential series. The series should not be editable on the transaction/invoice.

When users configure the sequence they should be able to set a post or prefix for the sequence (like for the custom sequences under System -> Sequences today).