Treat an unexplained short pay as a dispute: apply what was paid, leave the balance open, and ask the customer the same day what the deduction was for. Small unresolved short pays are how a clean account slowly accumulates an over-90 balance nobody can explain.
Glossary
Short pay
Also: short payment · partial payment
A short pay is a payment for less than the invoiced amount, usually because the customer took a deduction, disputed a line item, or had a PO for a smaller amount.
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