Unable to modify sale currency when created from sale opportunity
Steps to reproduce:
- Activate sale_opportunity module
- Create a new opportunity with a single product and convert it to a sale
- Open the sale, click on modify header and change the currency.
Current behaviour:
An error message is shown: You cannot modify the opportunity origin of the sale "(125)".
Expected behaviour:
No error message is shown and the sale currency is updated.
I found the issue on 6.0 series, but it is also reproducible on latest demo