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Can anyone explain why double entry accounting is used throughout Quickbooks apart from when you enter a bill and attach it direct to a customer account ?
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to answer the rest of your question
entering a bill does use double entry accounting, the bill is a credit in accounts payable, and what ever the bill is for is usually an expense, a debit.
that you associate a customer and perhaps make it billable has nothing to do with it. Until you invoice the customer and bring the billable expense to the customer invoice that billable status is just a reminder.
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