Creating custom field (auto increase number) in Header of Manage Sales Order App S4Hana Cloud

[ayechan]

Hi Experts,

I would like to add a custom field in Header level of Sales Order.

The custom field must have prefix value and must be increase 1 whenever new Sales Order is created.

(eg. SO-00000001, SO-000000002,.....)

To get this kind of custom field,

could you please provide any workaround, idea or documentation? 

Thank you.

Best Regards,

Aye Chan