Message SAP X4531 - Error in a cross-order relationship (PP)

Diagnosis
An error occurred during the processing of data for the cross-orderrelationship between operation &V1& in production order &V2& andoperation &V3& in production order &V4&.

Procedure
You can find the cause of the error in the subsequent message in theapplication log. Rectify the cause of the error.
If you cannot find the relationship concerned, there is an error in thegenerated relationship.
If you use order combination in DIMP, create an OSS message for thisoccurrence. Mention that you use order combination in DIMP and specifyhow SAP Support can find this message in the application log. You canspecify the date and time of the message, for example.
If you generate the cross-order relationships yourself in a user exitor BAdI, check your coding in the relevant user exit or BAdI.