Sched. Margin Key in Article Master for IS-Retail

Hello SAP masters,

I would like to ask on where could I assign the Sched. margin key in article master in IS-Retail, the one present in MRP2 tab in standard SAP.

I've already searched the site but all I could find is the way to set it up in standard SAP.

I hope you could help me.

Thank you,

Kristine