Virender,
Check below parameters
1.Whether BOM status is valid and validity dates.
2.Check the components MRP parameters
3.Check in MRP4 view for all materials whether dependent materials are not planned active?
4.Check the BOM components details for any explosion type assigned which is having planning off.
5.Check the planning file entries for not planned materials in MD21 and create them in MD20 if missing.
Post MD04 snap shots for both Header and Component materials
BR
KK