Discrete manufacturing... now you are talking about process theory. The end unit can not be disassembled or differentiated into its separate parts so it cant be discrete manufacturing. Unless I am wrong here about your end product RDM. It would be Process Manufacturing and then end up being rework under the following circumstances:
- material cannot be broken down into its initial parts
- material is not done the same way every time so it is not part of a regular process
- material is not standardized
- the client has specifically asked for the size or scope of the material to be outside of what is normally created
If, however, the client has not asked you to make the roll in this size and you are simply making the roll in the size it is supposed to be but your machine or process made it smaller for some reason then it would not be rework and would pretty much just be the cost of dong business.
I see it in the way of cases of product. Here is an example. I sell a case of 50 of widgets. If the customer wants me to make them a special case of 60 widgets then I have to "rework" the cases and make them a special case. I can usually do this with a price markup for the trouble. If, however, while making my standard cases of 50 widgets I find that there is a case with 40 and I need to add 10 from surplus then it is not "rework" because I am taking from other materials to make the standard size product.