create a service item, in the products & services list, called cust-dep ( if you accept both refundable and non-refundable deposits I would label this one cust-NR-deposit) and select the income account you want it to post to on the item screen
use a sales receipt to accept the deposit […]
Resolution for 'accept both issue: 'How do I post a payment for a customer deposit as a liability?' available: Yes.
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