Agree with Akshay,
Kindly refer the wording of section 194I and another deducting section i.e. 194C, J etc....These sections speak about "Any sum payable" while 194I speaks about "ANy Income".
These two terms are clearly distinguishable and denotes different meaning.
Hope your query is now resolved.
For 194I purpose, TDS will be on only rental amount and not on service tax amount.