[Execution] What do you do when invoices, receipts, and PO details do not line up?

I start by figuring out where the mismatch actually began. It could be a pricing issue, a receipt timing issue, a quantity error, a unit-of-measure problem, or a PO that no longer reflects what happened operationally. I do not want to treat all mismatches like the same clerical problem.

Once the source is clear, I fix the immediate exception and...