How do you create a journal entry in AR without cancelling each other? I.e an in-and-out journal entry

Hey there smarder-trinityu,

Welcome to the QuickBooks Community! Thanks for reaching out to us here. QuickBooks Online is a powerful software that can help keep your books balanced. Making sure you record your transactions correctly in QuickBooks is an important step in maintaining clean books. I recommend reviewing this article on how to correctly create journal entries in. 

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What type of entry are you doing that you have a debit and a credit for the same AR account?  

It is an ntry to represent an overpayment for something, but then the next month they will deduct it.  I.e. They only owe me $100 but pay $150, then in the next month, they owe me $75, but because of the $50 OP they only actually paid $25. I need a way to show a) the receivable of $50, and b) the $50 credit on 2nd payment

If you customer has an open invoice for $100 and they make a payment of $150, enter the payment of $150.00 against the open invoice.  This will pay the invoice of $100 in full AND create a credit on their account.  Make sure you enter some details in the memo section of the entry. 

This $50.00 credit on account can then be used next month when they make the payment of $25.00 (against the invoice of $75.00, using the credit on account of $50.00 resulting in a balance owing of $25.00).