On the payments and applications screen, type is customer refund and apply to documents of type prepayment, I’m unable to add finance charges. May I know what’s the logic behind where finance charges option is disabled for customer refund? And also, how can I process the finance charges?
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Customer Refund for prepayment , unable to key in finance charges
Best answer by Kandy Beatty
HI
According to help documentation, you can apply finance charges to credit memos and refunds:

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