Nirmal,
In the first few lines, in below link; it says that all the items shall populate in the Standard production order.
http://help.sap.com/saphelp_sbo2005asp1/helpdata/en/32/7324f9cdb04cbbaee3dafa4487d4b9/content.htm
What type of production order are you creating? Check that.
Also ask this question in the PP forum.