Check what is the schedule line category in your case?
F1- cons Pickup w. ACh - will transfer the requirements and shown in MD04.
F0- ConsPickup w/o AvCh - will not transfer requirements and not shown in Md04. reason is the below two fieds are NOT checked.
1. Req/Assembly
2. Availability check
Also refer the very useful document if the above settings are correct.
MD04: Problems with sales orders
thanks,
Srinu.