Possible entries not supported for 'Special Ledger'

What causes this issue?

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

System Response

The validity of the accounts can only be determined in extended
general ledger when the translation is being carried out.
Therefore, the possible entries are not displayed.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.