MMI suggest you also look at customer behavior. Payment lead time averages can be skewed by a small number late paying repeat customers. With this group I have seen these factors:
-payment term discrepancies (vendor bid said 30 days while customer P.O. said 60),
-lack of discounts offered for quicker payment (some customers are mandated by upper management to take all discounts),
-lack of invoice detail (slowing down client approval for payment). If late payers are concentrated in your data, then talking to them may be one of your early steps.
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