PPA (prior period adjustments) are common and frequently go back for several years. They are due to later determination that the volumes or sales were either over-reported or under-reported on the original checks. Or when the DOI is corrected. Usually the adjustments are small. You need to look at both the negative reversal and the positive adjustment for each month and for each product to see the net for the month. No one complains when the net result is positive.
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