---
title: "\"Errors syncing invoice: Error: Duplicate Document Number Error: You must specify a different number. This number has already been used. DocNumber=XXXX is assigned to TxnType=Credit Memo with TxnId=XXX\""
description: "\"Errors syncing invoice: Error: Duplicate Document Number Error : You must specify a different number. This number has already been used. DocNumber=2642-2 is assigned to TxnType=Credit Memo with TxnId=7046\""
---
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# "Errors syncing invoice: Error: Duplicate Document Number Error: You must specify a different number. This number has already been used. DocNumber=XXXX is assigned to TxnType=Credit Memo with TxnId=XXX"
## Fix invoice sync errors in QuickBooks Online caused by duplicate transaction numbers.
### Issue
The error message:
> **"Duplicate Document Number Error: You must specify a different number. This number has already been used. DocNumber={207083-2} is assigned to TxnType=Credit Memo with TxnId={54993}"**
indicates a conflict in QuickBooks Online. It means a credit memo in QuickBooks shares the same transaction number as an invoice, which causes the synchronization to fail—QuickBooks does not allow two transactions to use the same document number.
### Resolution
To resolve the error, try one of the following options:
**Option 1: Change the Credit Memo Number**
Update the transaction number of the credit memo in QuickBooks Online so that it no longer matches the invoice number.
**Option 2: Cancel and Recreate the Invoice in ServiceBox**
Cancel the invoice in ServiceBox and create a new one. The new invoice will have a different number that avoids the conflict.
**Option 3: Allow Duplicate Transaction Numbers in QuickBooks Online**
Adjust your QuickBooks Online settings to allow duplicate transaction numbers.
Refer to this QuickBooks article for instructions:
[https://quickbooks.intuit.com/learn-support/en-us/reports-and-accounting/duplicate-invoice-numbers/00/187161](https://quickbooks.intuit.com/learn-support/en-us/reports-and-accounting/duplicate-invoice-numbers/00/187161)
Choose the option that best suits your accounting setup.
### **Need Help?**
If you have any questions or need support, please click the **Help** button in your ServiceBox account or email us at **support@getservicebox.com**.
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