transaction/event keys

Dear Experts,

Where can i see the transaction event keys..

SPRO - Materials Management - Purchasing - Conditions - Define Price determination process - Define transaction/Event Keys.

If i go this path..only few transaction keys like AG1,2,3 and FR1,2,3,FRE is available. Where i can fine the rest keys like BSX, GBB, WRX, PRD etc..

Regards,

Prasath