Amend a "paid" invoice?

Hello,
I use QuickBooks Premier Edition 2006 to create my invoices. In doing so, I like to have the date of the invoice match the actual date of the work
performed or delivery date of the product sold. I find it easier to keep track of billable hours that way should a question ever arise about when the work was performed. It then becomes an easy matter of checking the QB time input against the respective date of the invoice.
What has happened is that I forgot to include a couple of products on one or more invoices. Typically, that wouldn't be a problem, as I could simply add them to the invoices and reprint them. However, it turns out that the invoices have been paid with the notable exception that I have yet to receive the customer's check. The "check is in the mail", so to speak. At least that's what I've been told.
So, what would be the best way to correct this? I suppose that I could simply create a new invoice for the missed items and reflect in the body of the invoice that they were delivered or installed on the dates of the previous ones and reference their numbers, although I'd rather not do it that way.
If it turns out that the customer hasn't actually sent out their check yet, then I can follow my original plan of adding the items to the existing invoices. On the other hand, if they have already sent out their payment, what options do I have? Should I add the missing items to the existing invoices thereby increasing their balance due and then just apply the customer's check against them as a partial payment? Obviously, I would also need to send the "updated" invoices to the customer which would reflect any payments received against the higher overall balance.
Thanks in advance to those who post a reply to the group.
Peter.
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Peter Bogiatzidis wrote:

This is more of a bookkeeping rather than a QuickBooks question....
First I never consider an invoice paid until I receive and record the check. Just because a customer says "the checks in the mail" does not make it paid.
If I have sent an invoice to a customer I never modify it. It usually just causes confusion if the customer disputes the bill. Much better paper trail if you just create a new invoice for the additional services or products.
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Thanks Laura for your input.
I had thought that the customer had already printed or written the check. It turned out that he hadn't, but did so on a recent visit. I'll just bill for the forgotten items on another invoice along with the recent work that was performed.
Peter.
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On 2012/08/02 09:42, Peter Bogiatzidis wrote:

Why not just add the Service Date column to your invoice, that way each line item for billable hours can show its relevant date regardless of the invoice date?
--

Mark Bole, EA
Enrolled Agents - America's Tax Experts
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