The scenario:

SO with Invoice Discount + Prepayment % + Prepmt. Include Tax = TRUE, producing incorrect (tax-exclusive) posted amounts starting from BC 27.5 in the procedure UpdateDifferenceAmount of Codeunit Sales Post Prepayments. The issue is reproduced on the BC27.5 NA.

AR: Posted amount exclued tax

ER: Posted amount includes the full amount, including TAX