Add discount condition type in Debit Memo Request (DMR1)

Dear SAP Experts,

I have a requirement where user requested to insert discount in DMR (doc type DMR1). It is to discount from the net value. I have configured a condition type for this. The issue now is DMR1 order type cannot be process according to SAP Note 3003689

3003689 - You cannot process a sales document with order type DMR1 (PBS) - SAP ONE Support Launchpad

And there is no functionality to add condition type in the 'Edit Billing Request' app. Appreciate if anyone has idea on this.

Kind Regards,

Win Nee