HTTP proxy &: Could not update database table

What causes this issue?

An error occurred when the SQL statement UPDATE PPROXY_C was executed.

System Response

The entry is not processed.

How to fix this error?

Contact your database adminstrator. Ask the adminstrator to check the
database table PPROXY_C.
After you have removed any database problems, schedule the XPRA report
RSXPRARFCICF again as a background job.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.