I disagree: materials do not always follow the same route and some flexibility is required.
Your solution implies that this material will always follow the route of being non valuated etc.
so it is not a good solution for me: it doesn't matter if it is a correct solution: many solutions are correct, not only this one;
I need to find the one that is suitable for our needs, not convince Business!
an entire complex procedure is behind materials....it is not a "small change"!