Diagnosis
Payment terms (term header) and payment items (term items) are assignedto every rental agreement. These contain a date specifying when theterms are valid from. The validity date of the items must not be beforerental start.
In addition, the payment start date (date of first debit position) mustbe equal to or before (e.g. in the case of rent-free occupancy) thevalidity date of the term header.

System Response
The entry cannot not be processed further.

Procedure
Select a validity date which is after or on the same date as thepayment or rent start.