SAP Message CACSAPPL503 - No task has been defined for application &1

Diagnosis
A comparison has to be run for application &v1& due to an upgrade orchange in package selection or activation/deactivation of anenhancement. Background processing has been scheduled for this.
During the execution of background processing, the system detected thatno further information is available on how processing should be handled.

System Response
Processing is terminated.

Procedure
Check if the task has already been carried out in another processingactivity. In this case, you should find the corresponding logs andfurther information in transaction CACS_UPGRADE.