BADI doubt

i am found a badi which fits my requiremnt (i.e. CRM_MKTTG_SEG_MEM_EX).

This same badi gets called on two different events.one when i click a hyperlink on the campain and another when i click on export to file.i want my badi implemntation to be called only once i.e when i click on export to file.can somebody please suggest a solution on how can i acheive this.

or let me know the code in which i can find the event triggred and put a conditon on that.