Diagnosis
You want to tenant rent object &V1& with contract &V2& and object &V3&with contract &V4& within overlapping time periods.
These two objects have a hierarchical relationship, meaning that oneobject includes the other. Since the periods overlap, the subobjectwould be tenant rented twice, once directly and once indirectly in thehigher-level object.

System Response
The system does not allow multiple tenant rental.

Procedure
Tenant rent only one object for each period in one of the followingways:
Select assignment periods that do not overlap for the objects-contractassignment
Select, for one of the agreements, an agreement typefor which the object-contract assignment has notbeen defined as "Objects are T-rented".