Subsidy (preference )amount deleted

What causes this issue?

No entry has been made in the field for the subsidy (preference)
indicator. This means that no reduction is made in accordance with
the Berlin subsidy law. Therefore the system deletes the entry in the
field for the subsidy (preference) indicator.

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?

Check if a subsidy (preference) indicator has to be set and enter this,
if required.

Error message extract from SAP system. Copyright SAP SE.