Summary table & has not been defined correctly (see ledger &)

What causes this issue?

The summary table assigned to the ledger was not found in the table
directory.

System Response

The system cancels processing.

How to fix this error?

Call up the configuration menu to check whether the correct summary
table is assigned to the ledger.
In the Special Purpose Ledger configuration menu, you can access the
table directory under the menu 'Environment' menu option. The summary
table must be defined in the table directory.
Only the summary tables defined in the table directory can be assigned
to the ledger.

Error message extract from SAP system. Copyright SAP SE.