There are no cash flow items

What causes this issue?

Possible reasons that there are no cash flow items:
There are no conditions that are considered during periodic posting
(refer to <DS:DE.RECDCONDPURPOSEEXT>condition purpose</>)
The rental object involved is not vacant.
The condition start for the rental object condition is after today's
date (the cash flow for rental object is generated only up to the
current date).
The settings for the calculation of the condition results in the
calculation of a condition amount that has the value zero.

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.