Works contract tds under vat-on invoice where vat is charged

If Service & Supply Are Seperate  Then There Is no need for deduction of  Wct. 

CMC bill issued by a company-

Invoice total -Rs.1,09,750

Material charges-50,000+2500 vat

Service charge-50,000+7250 service tax.

Both are charged in a single invoice ....Since vat & service tax is charged seperately no need to deduct work contract tds....

What if no vat is charged & service tax charged....is it necessary to deduct work contract tds..again here also material charges &service portion can  be segragated.

if in invoice Material and Service charges are mentioned separate than that is not come in the defination of work contract

and if in Invoice there is no separate value in this just contract value mentioned where ST charges as per RCM than it is liablie to deduct work contract on Gross AMount