QB Issue Resolution:

You will need to turn off all “Bills and Expenses” features related to Items.

You cannot do that just for Check Form only.

From the home page screen > Company Gear (upper right corner) > Settings > Company Settings > Expenses > Bills and Expenses > Turn OFF all 3 items related features.

Resolution for Issue 'Item details when writing checks' available: Yes (Solved).
Source: Intuit Community forum.

Item details when writing checks: 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 Bills and Expenses
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Error Recovery for Bills and Expenses [Canada]
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