---
title: "Sage - \"Invoice Number is Undefined\" Sage"
description: "Sage - \"Invoice Number is Undefined\" Sage"
---
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# Sage - "Invoice Number is Undefined" Sage
## What to Do When ServiceBox Invoice Numbers Don’t Transfer into Sage
Sometimes during a sync with Sage, a customer will report having trouble transferring invoice numbers from ServiceBox, and seeing this message:
[](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/19070135511/original/la_8PFFS-kwvdNP6PNyHvPteAIaSSzcVRw.jpg?1610132635)
The good news? The fix is straightforward. Follow the steps below to ensure that your ServiceBox invoice numbers carry over correctly to Sage.
### Two Key Settings to Check
#### 1. **Clear the "Next Form Number" Field in Sage**
Go to the **Forms** page in Sage and ensure the **Next Form Number** field under Invoices is left **blank**.
> If this field has a number in it, Sage will try to take over invoice numbering and ignore what ServiceBox is sending.
[](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/19070136027/original/_X29NRM26baLk6jAd2QDYk6XZoyymHt0Xw.png?1610133660)
#### 2. **Enable ServiceBox Invoice Number Sync in the Connector**
Open the **ServiceBox Accounting Connector** program and do the following:
- Click **Setup**
- Go to the **Export/Import Settings** tab
- Check the box that says **"Use ServiceBox invoice numbers in accounting"**
> This setting tells Sage to use the invoice numbers generated by ServiceBox instead of creating its own.
Once both settings are configured correctly, syncing should resume without any issues related to invoice numbering.
[](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/19070136196/original/btKBUSNAFQNAOGuhOnIszUOINe4bMfH-yQ.png?1610134055)
**Need Help?**
If you're still experiencing issues, reach out to our support team by clicking the **Help** button in your ServiceBox account or emailing us at **support@jobboxsoft.com**.
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