There are judgments of Hon'ble of various Tribunal that if the contractor is providing manpower for providing taxable services on piece rate, then it won't come under the Man Power Recruitment and Supply Services, it would be treated as BAS.
From, 01-07-2012, service tax is charged on almost each and every services (except on Negative List and Services as mentioned in the Mega Exemption Notification dated 20-06-2012), therefore service tax would be applicable.
But if the services fall under the list of 119 specific services, as mentioned in the Circular No 165/16/2012-ST read with Notification No. 48/2012-ST, then, specific code should be mentioned while deposition of service tax.