QB Issue Resolution:

I put the FY and a hyphen before the number, that seems to work and only the serial number increments

18-xxxx
19-x

Resolution for Issue 'i have closed books for once financial year (FY) & want to start accounting for next FY but i am unable to use invoice no 1 as it was already used in previous year?' available: Yes (Solved).
Source: Intuit Community forum.

i have closed books for once financial year (FY) & want to start accounting for next FY but i am unable to use invoice no 1 as it was already used in previous year?: 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 financial year
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Error Recovery for financial year [Canada]
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