Credit Management in S/4HANA 1511

Hi Experts,

Need your help on below query.

We are implementing S/4HANA on premise 1511 for a client and they don't have PI integration. I see that FSCM credit management would work with PI system in S/4HANA. I have looked at couple of blogs where in it says FSCM credit management can be implemented without PI but with WS-RM in ECC system.

Is there a way to implement this without PI system or any alternate approach to get this done in S/4HANA?

Appreciate any inputs.