Size from which entries are to be written to larger persistence

What causes this issue?

The cache mode "Query Aggregate" uses a cluster table and BLOB storage
(table with XSTRING area) to store cache entries with query data. This
setting specifies the size limit up to which the system is to write to
the memory area for smaller query results and when it is to use the
memory area for larger data.
Using the following two settings, you can specify which of the memory
areas is to be used for the query results that are larger than the key
figure specified here.
You specify which memory area is to be used when you create the cache
entry for the query data; once specified, this value cannot be changed,
even if the cache entry is later larger than the predefined key figure.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.