This combination of entries does not make sense

What causes this issue?

You have selected the indicator allowing posting to the previous period
as well as the indicator generally disallowing posting to a prior
period. This combination does not make sense.

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?

Please check your entries and correct them.

Error message extract from SAP system. Copyright SAP SE.