Data slice '&2' protects the characteristic combination

What causes this issue?

A data slice has been created for InfoProvider '&V1&'. The data slice
has number '&V2&'. This data slice contains the current combination of
characteristics. Therefore changes cannot be made to this combination of
characteristics.
If the data slice has number '9999', the data slice is generated by the
system at runtime from the data slices in the system.
If the data slice has number '9998', the data slice is generated by
planning process management.

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

A data slice with number '9999' combines all the data slices of type
Selection. This means that the system only has to check one data slice
of this type. Data slices of type Exit and data slices from planning
process management cannot be combined with other data slices.

System Response

The data record cannot be changed.
In manual planning, this means that data cells in the query are not
input ready if they access this record. If you enter values from cells
protected by data slices in new rows, the system resets the entry.
You cannot execute planning functions that try to change the data
record.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.