PI and CE Enterprise Service Repository

Hello,
We currently have PI 7.0 and we are planning to upgrade to PI 7.1 furthermore we are testing CE 7.1 with some small applications. It's possible that according to our designed scenarios some of them will run on CE and other and PI and some complex scenarios will run on both (for example in the case of BPM and B2B).
Our question is:
Should we use only one ESR and one UDDI Registry for both PI and CE ?.
The Enterprise SOA documentation talks about one ESR and one UDDI Registry but some practical documents and examples aren't very clear when both products are used.
Thanks in advance.
Yuvan.

Hi Stefan,
Thanks for your early reply.
My doubt was because I read in some place that the ESR of PI and CE have some small differences. So I wasn't very sure that the ESR of PI could be suitable for CE too.
Thanks...

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