Hi,
First things first. This might be a VC Forum Question even though this is SD component of VC.
Also I am not sure how you can get a Configurable Material whether using FERT or KMAT Product without having BOM. Some details on the reason for using VC for the material would help.
If you can give the expansion of the values C and 01[I do not have the SAP Log In in front of me] that would help too.