Dear Mr. Saha, when you are putting up a query, you have to provide maximum information relating to the issue for one to understand the exact nature of the problem. Here, you are silent on the type of industry you are operating in. In fact, that is the factor that decides the "Appropriate Authority" for you, either as "Principal Employer" or as "Contractor." The tussle between the Central Labour Office and the State Labour Office is perpetual. Both authorities, however, would never face each other even in a Court of Law.
I wish to quote an incident here when a civil construction company was entrusted with a contract for pile foundation and construction of civil works by ONGC in connection with the building of staff accommodation. As was known even to ONGC, they asked the contractor to contact the Central Labour Office and issued FORM V to them. The contractor accordingly submitted and obtained a license under the Act from Central.
The problem started when the State Labour Office peeped into the work activities at the site and issued a "Show-cause," leading to prosecution for "Not obtaining License" from the State and charged the contractor with a heavy penalty. There were protests both from the contractor and the principal employer, and the case went to adjournment for the decision of an arbitrator. After nearly 1.5 years, it was decided that though ONGC is in the Oil & Gas sector, the very nature of the contract work executed (pile foundation and construction of civil works) has no connection with Oil & Gas and hence, it has to be under State Labour jurisdiction.
So, kindly be very specific with your queries, please.