What is the demarcating line between sovereign and non-sovereign functions?

In a welfare state, the functions of the state are not only to defence of the country or is administration of justice or maintaining law and order but it extends regulating and controlling commercial, social economic, political and even material. The demarcating line between sovereign and non-sovereign power for which no rational basis survives has largely disappeared. Therefore, barring functions, such as, administration of justice, maintenance of law and order, and repression of crime etc. which are among primary and unalienable functions of constitutional government other functions are not sovereign functions.