Check confirmed date and quantity for STOs not supported by advanced ATP

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.

System Response

You want the availability check to use the confirmed date and quantity
for stock transport orders (STO). Therefore, you have chosen option A in
the <LS>Incl. Purchase Orders</> field. For the checking group, however,
the advanced ATP check is active. The advanced ATP check does not
support this feature.

How to fix this error?

If you want to use this feature, deactivate the advanced ATP check in
the checking group (in the
<DS:SIMG.SIMG_CFMENUOLSDOVZ2>Define Checking Groups</> Customizing
activity).

Error message extract from SAP system. Copyright SAP SE.