Diagnosis
You are trying to carry out a reporting point backflush for a date inthe past.
Since changes have already been made to the milestones in thecorresponding routing, a version-specific calculation (preliminarycosting) must be carried out, in order to update the reporting pointstructure. It is not possible to do this using a date in the past.

Procedure
Because the routing has been changed, nothing can be posted for a datein the past (exception: posting in the previous period). Change theposting date correspondingly.