Some availability check results could not be displayed.

What causes this issue?

Some of the checked items use Alternative-Based Confirmation (ABC)
functionality which led to a check result that can?t be displayed
without additional configuration.

System Response

The check result of the impacted items was not displayed. The
availability check, however, was executed normally and the confirmations
were taken over into the order.

How to fix this error?

Activate the Review Availability Check Result (RACR) functionality.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.