HI Martin,
TranComp is the total number of HTTP components matching the Transaction Component definition in the TIM, (Component definition is under Business Services > Business Transactions > Transactions > Components)
Transets is the total number of Business Transactions the TIM is able to match , basically every Transets should have one or more TranComp.
I dont think this is documented anywhere ,you can check the Transaction Definition Guide which will your best bet.
Please let me know for any questions
Regards
Vijay
CA support