The operational waste score is a measure out of 100 of money leaving the business without producing anything. A high score means little waste.
What pulls it down
Duplicate payments — the same bill paid twice. Each one is recoverable money sitting with a supplier who has no reason to mention it.
Negative margin — work sold for less than it costs to deliver. This is the heaviest penalty in the score, because it is the only one where doing more business makes the problem larger.
Overhead above about a quarter of expenses — fixed costs grown out of proportion to the work they support.
Why these three together
They are the three kinds of loss that produce no complaint from anybody.
Nobody notices a duplicate payment, because the supplier is satisfied and the bank balance is only slightly wrong. Nobody notices a job sold at a loss, because the customer is happy and the crew was busy. Nobody notices overhead drift, because every individual cost was justified.
Losses that announce themselves get fixed. These are the ones that do not.
Reading it
The score is only useful decomposed. A 70 caused by three duplicate payments is a morning's work with the money coming back. A 70 caused by negative margin is a pricing problem that will take a quarter and will recur until it is fixed properly.
Treat the number as a prompt to look at the three components, never as the finding itself.