QB Issue Resolution:

Happy New Year’s Eve! You should be able to add a check number as follows:

Go to Reports (left navigation bar)
Type pay in the Go to reports box
Click Paycheck List
Select the appropriate Date Range > Run Report
Click the $ amount under the Net Pay column
Add/Edit the check number (upper right) > OK.

That should do the trick! Please let me know if I can assist further!

Resolution for Issue 'I forgot to enter paycheck numbers so I need the information unlocked so I can add them.' available: Yes (Solved).
Source: Intuit Community forum.

I forgot to enter paycheck numbers so I need the information unlocked so I can add them.: 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 Paycheck
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