QB Issue Resolution:

you only need to enter a bill if you will be paying the bill at a later date. if you purchase something and pay by check and record it immediately, simply write the check and use the appropriate account.

Resolution for Issue 'DO I HAVE TO MAKE A BILL FOR EVERY CHECK I WRITE TO A VENDOR?' available: Yes (Solved).
Source: Intuit Community forum.

DO I HAVE TO MAKE A BILL FOR EVERY CHECK I WRITE TO A VENDOR?: 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 billing
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Error Recovery for billing [Canada]
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