Clearing differences not possible for storage tye &

IF &[SWITCH]S4H_DOCU_ON_PREMISE& = 'X'.

What causes this issue?

In Customizing, it has been set that clearing differences is not allowed
for this storage type in inventory management.
This is in order to avoid stocks being changed into storage types
accidentally, as these have not been scheduled.

System Response

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

How to fix this error?

Select another storage type. In the standard delivery, the storage type
'999' is scheduled for clearing differences in inventory management. If,
however, you wish to clear from this storage type, you can do so by
changing Customizing.

Procedure for System Administrators

If you wish to clear the differences from this storage type, choose the
action <ZH>Disallow clearing storage types</> in Customizing, under the
activity <DS:SIMG.SIMG_CFMENUOLMLOMLL>Clear differences</>, and remove
the indicator <DS:DE.T331_NODIF>No differences</> for this storage type.
ENDIF.

Error message extract from SAP system. Copyright SAP SE.