This is a known behaviour of Mosaic and can occur particularly where services are configured to be pro-rata, and how the system rounds payments having difficulty balancing amounts.
Pro-rata payments and the penny differences where seen can come in where the weekly payment is split over two invoices and the difference is adjusted in the two invoices so the total for the week matches the commitment, and the difference is ironed out.
Therefore, you may find over a few payment cycle periods that the invoices balance out so that what was 1p under expectation is 1p over expectation in the next cycle, with the net effect of balancing the expected payment.
If needed, as a workaround, please add a variation which would rectify the value required but otherwise this is the way Mosaic has behaved historically and just something to be aware of at your site.
If your case is not as described, then please raise a new case online and reference the title of this article.
Invoice total up or down by a penny
In this article, we look at why some invoices are paid 1p over or under the expected amount and what can be done to resolve it.
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Written by Yusef Abulaynain
Updated over 4 months ago