I want to set the starting   invoices sequence (e.g. 74000 in new odoo 13 setup) which is continue number from the old system.

I have the following setting

Sequences >> Payments customer invoices sequence

Implementation : Standard
Prefix: INV/
Use subsequences per date_range: uncheck
Sequence Size: 5
Step: 1
Next Number: 74000
Saved!

But when I create new invoice from sales order, the Customer Invoice still INV/2020/0001

Any ideas?

Peter