Both goes together, when your RP is done in the PP, next is your ID card which is ready immediately on paying the fees. Doing only RP and moving around with out an ID card is unacceptable, cause the original PP is with the sponsor, you are supposed to move around with the state ID card, in the event of any unforeseen, your ID card helps to identify who you are. Its a must to carry a ID card for all matters, Better stick to rules otherwise face consequences.