Hi Rio,
Goto class: /SAPTRX/CL_RULES_PROCESSOR_40 Method: Process_Rules. Check the following parameters each time you go in there and see if you can see your rules are coming up or not.
MY_RULE-ACTIVITY_ID
MY_RULE-RULE_ID
Easy way to do it is after you post the event, do a simulate mode from EH_LIST view and see if your FM is being processed or not.
Thanks,
Vishnu