"for example, the purchase actually being a pack of 100 but logged as a single item."
This is a constant problem at $EMPLOYER. Twats in various departments insist on ordering 1 or 2 ethernet cables at £1 each (or less), despite being repeatedly told that the _internal_ costs of raising orders means that anything less than £20 is not economic - and the suppliers have responded to the abuse by padding prices across the board to take shipping into account, which means when I order £200 pounds worth of cables it can now cost £450.
And yet procurement thinks this is alright.....