Requesting detailed config and setup for forecast 'period splitting'

I have searched the SAP community, and found little detailed information about configuration and setup for SAP forecast 'period splitting'.

I have selected the standard scenario in the 'Splitting Indicator' (1 - 2 - 4) in MM03/MRP3 for splitting month periods into weeks - AND - I have set the MRP Type found in MM03/MRP1 to 'VV' as specified (with "obligatory forecast indicator set on, which supports forecasts to be used as a basis for MRP).

Doing so has not resulted in my monthly inputted forecasts being split into weeks.

I am thinking that there is some missing configuration that is needed. Please advise if you can.

Thank you