AX - BOM net requirement and master planning

Hello,

I am using AX2009.

I need to customized the BOM - by adding new condition to find the Color.

I check the class ReqCal, BOMsearch, and now the customization work in Sales line -> Create Production.

But in Sales line -> Net requirement, I am unable to make the customization work.

Does anyone study the Net requirement?

What is the class / logic that used in Net requirement and BOM search?

Thanks