Tds on work contract

Hello

I issued a work contract to supplier including material. This supplier only issuing Bill showing VAT. No seprate bills for laboure work supplied to me. His explanation is that Rate charges in the material Bill inclusive of laboure rate.

My company is following ESI,P.F.,TDS, Service Tax rules for every laboure work. I wants to release his payment. Kindly suggest me what legal rules I apply before releasing his payment.

Supplier is ready to bare any legal deduction from his bill. Please tell me is there any specific ratio or standard for seprating laboure portion from such bills.

Thanks