When you do a search, use the advanced setting.  Filter it to invoice number.  If you click save and new, you should not get duplicate invoice numbers.  You can also look in the list of sales.

You may also want to look at how you are doing the billing to see […]

Resolution for 'advanced setting issue: 'Searches are not getting results, they did in the past. A recent search using custom field one did not get a result, if entered info by invoice for the same I do.' available: Yes.

The advanced setting 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 advanced setting issue yourself by looking for a resolution described in the article. If it is a complex advanced setting issue or you are unable to solve the issue, you may contact us by clicking here or by using other advanced setting support options.

For more information about resolving issues related to advanced setting in Quickbooks/QBO or to get support for the issue 'Searches are not getting results, they did in the past. A recent search using custom field one did not get a result, if entered info by invoice for the same I do.', click the link below: