Problem: A collection frequently times out or generates errors citing the REJECT_DUPLICATE_RESOURCE_AND_COLLECTION policy, but no problems with the monitored resources are evident.
The errors appear in the log and on the collection history screen.
Solution: Try to determine why the collection is taking so long. For example, are network delays slowing down traffic between SAP Control Center and the monitored server?
In the case of network delays and other resource-related problems, the interval between collections might be shorter than the time needed to finish the collection. To fix this problem, increase the time between collections.