Seems that in BC SaaS v20.0.ES standard fields of type Code don't sort properly when you use number codes.
We have needed to cut the numbering of the Sales Orders "No." and this is the result now when sorting by the PK the Sales Orders List.

I think this is a global standard Bug...
Could someone report it to Microsoft?
NOTE.- The chosen numbering has not depended on me and it is too late to change it...