aATP is inactive for checking group &1; Quantity Dist. is not supported

What causes this issue?

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

In the checking group mentioned above, the advanced ATP check is
inactive. Quantity distribution is supported by only advanced ATP.

System Response

How to fix this error?

Procedure for System Administrators

To activate aATP, in the Customizing activity Define Availability Check
Group, choose Active in the dropdown list for Advanced ATP.

Error message extract from SAP system. Copyright SAP SE.