IDoc Monitoring: Data collection not getting completed

Hi,

I have setup IDoc monitoring in Solution Manager 7.1 SP08 for managed systems which is on ST-A/PI 01Q. There are many IDoc being generated in the managed system but I am not getting any alert for it.

In the alert inbox I get the message that the data collection has not yet taken place since the last activation. and the last data collection time is shown as of 2009.

Also in the managed system the BPMon background job BPM_DATA_COLLECTION_2 get cancelled with run time error TSV_TNEW_BLOCKS_NO_ROLL_MEMMORY

What can be the issue?

Regards

Vishal