What is specified domestic transactions ?

It relates to transfer pricing.It includes

Transaction for expenditure for which payment to be made to close relatives(as per sec 40A(2))

Inter unit/Inter business transfer not at market price(as per sec 80A(6))

Inter unit/Inter business transfer of goods/services meant for eligible business(infra development) not at market price(as per sec 80IA (8))

Transaction as per pre arrangement for excessive profit between assessee doing eligible business(Infra development) and his/her close relative(as per sec 80IA(10))

Any other inter unit/business transaction( related to any other sec under chapter VI-A or sec 10AA(newly established SEZ provisions) in the nature of above two type(sec80IA(8)/Sec80IA(10).

provided these are not international transactions and their agreegate value is more than Rs. 5 Cr in the previous year.

Specific domestic transaction covered by Transafer Pricing Regulation 
Specific Domestic Transaction term use for related party transaction which threshold limit specified U/s 92 of Income Tax Act, 1962. for more information  you can refer Section 92 or 40A of Income tax act, 1962