Message SAP BIL018 - Secondary installation &1: Billing period of higher-level inst. not valid

Diagnosis
The start of the billing period, &v3&, does not match
V4, which is specified as the start of the billing period forhigher-level secondary installation &v2& forsecondary installation &v1&.
Background:
This situation is similar to that described in error message017. The system did find a billing document forhigher-level installation &v2&. However, the start of the billing periodfor the higher-level secondary installation must not be after the startof the billing period for the lower-level secondary installation.
Possible cause:

  • You performed interim or final billing for secondary installation &v2&
  • without billing the lower-level secondary installation &v1& on the samedate.

    Procedure
    Bill the secondary installations on the same date.