Custom Field on Sales invoice

Hello,

I have set two custom fields to appear on Sales invoice, but none of them is seen on sales invoice. I see these fields on invoice form (for example “Bank details”), but these fields are empty i.e. text with bank details was not transferred from Settings. If I enter manually, they appear on printed invoice.
Is it at it should be?

i am sorry, but cannot provide screenshots at the moment.

S.

ok, I found it. Text appears in newly created invoices, but old one, must be edited manually.

That is how it is designed, so you aren’t modifying previous invoices if you change something.