SAP Message UPS097 - Preceding unit &1 is not yet posted

Diagnosis
For the current distirubtion unit, unit &V1& was defined as apredecessor. This unit must be posted in the target system before thecurrent unit can be posted. Unit &V1& has therefore not yet beenposted.

System Response
The system cannot post the current unit.

Procedure
First post unit &V1&.