BOM Config

Dear experts

i hav an problem in BOM,even when after config, the components are not displayed in SO,only main material is appeared what to do for this.

i have gone to CS01= created BOM for a material 418.and its components are material 419 &420.

by going to CS11 = BOM has exploded,but in sales order only one material 418 is shown.

in item category i hav assigned as orERLATAP+TAQ

plz help me

regards

arpoongs