Look in the Register view, bottom left, to confirm you are Not checkmarked as 1-line.
Now each two lines is one Transaction. Stop working in the Register View. Make Transactions. Banking menu > Write Check. From the Register view, double-click where you see CHK. Here is the Real View for input. […]
Resolution for 'Check Register issue: 'Check Register' available: Yes.
The Check Register 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 Check Register issue yourself by looking for a resolution described in the article. If it is a complex Check Register issue or you are unable to solve the issue, you may contact us by clicking here or by using other Check Register support options.
For more information about resolving issues related to Check Register in Quickbooks/QBO or to get support for the issue 'Check Register', click the link below: