MRP Exception Message in MD04

Hi team,

My entire MRP planning is being carried out in APO system. My R/3 system just receives the planned orders from APO & i will convert the planned order to production order (MASS). Hence i did NOT maintain any configuration in OMDW for my plant. Is this OK or should i maintain OMDW for my plant in R/3 even though my planning is happening in APO?

Thanks