QB Issue Resolution:

Thanks for the attachment. Please check these things to better isolate the issue,

Check if the same problem happens to other accounts, vendors and customers
Check if the same problem happens on the sample company file

You may open up a sample company file by going to File menu> Close Company/Logoff> No Company Open> Open a sample file

Resolution for Issue 'I’m unable to put a check in the Billable column of a check written.' available: Yes (Solved).
Source: Intuit Community forum.

I’m unable to put a check in the Billable column of a check written.: 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.

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