QB Issue Resolution:
After you save on invoice with a certain number, the next invoice should pick up the next number in the sequence. I just tested in my system and saved invoice 1408 and now it’s on 1409…Is there any chance anyone else in your company is working on the program at the same time?
Resolution for Issue 'How can I get QuickBooks Online to pick up my invoice sequence?' available: Yes (Solved).
Source: Intuit Community forum.
How can I get QuickBooks Online to pick up my invoice sequence?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Invoice
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Error Recovery for Invoice [Canada]
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