St abatement on car hire

In Reverse charge Machanism, there is 60% and 40% ST liabilty criteria with abatement and 100% ST liability of reciepient without abetment. (In case of servive provider is non corporate and receiver is corporate).

The question is how i come to know that Vendor raised the bill is with abatement or without abatement?

whether if vendor lavied his part it is to be conciderd as with abatement and if not lavied ST in bill it is to be concider as without abatement?