Which tax is attributed as per place of services?

This query is : Resolved

rupesh (Querist)
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13 March 2018 we have construction of flats in karnataka where GST no has been taken. but we have registered head office at mumbai having GST NO too. now we have taken services of computers wherein party ask for GST no. place of receved serices in mumbai head office and place of service provider in mumbai. in this case i have given him Karnataka GST no to prepared the bill to take the benefit of ITC as IGST instead of maharashtra GST NO. which we possessed in this cased but not given him this no. ?
so my q is will it do to given karnataka GST no for ITC beacsue our sale is booked in karnatak gst no . not in mumbai . ? is it ok or other scope to get benefit of the same. in other manner of laws