fill container for alerts

Hi.

I created alert that is triggered via action. The alert now displays only some text that i defined. But now I would like to get in that text also the value of transaction number of task from witch alert was triggered.

I saw that there is the option on alerts to define container (SPRO > CRM > basic functions > alert management > define alert categories) but I don't now how to do it.

I added in container BOR object type BUS2000125 and in text the expression &PROCESS_TYPE.OBJECT_ID&, but looks like that is not enough.

Help needed.