return t8('Credit note (one letter abbreviation)') . "(" . t8('Storno (one letter abbreviation)') . ")" if $self->invoice_type eq 'credit_note_storno';
return t8('Invoice for Advance Payment (one letter abbreviation)') if $self->invoice_type eq 'invoice_for_advance_payment';
return t8('Invoice for Advance Payment with Storno (abbreviation)') if $self->invoice_type eq 'invoice_for_advance_payment_storno';
return t8('Credit note (one letter abbreviation)') . "(" . t8('Storno (one letter abbreviation)') . ")" if $self->invoice_type eq 'credit_note_storno';
return t8('Invoice for Advance Payment (one letter abbreviation)') if $self->invoice_type eq 'invoice_for_advance_payment';
return t8('Invoice for Advance Payment with Storno (abbreviation)') if $self->invoice_type eq 'invoice_for_advance_payment_storno';