MRER vs MRRL for SUS invoicing

Hi Gurus,

We're currently using MRER to generate ERS invoices. The SUS docs say that you should use MRRL. While we can switch over (we're not automotive, and I'm unsure why MRER was chosen originally) if we can stick with MRER, I'd rather do that. It appears that we can push invoices to SUS, but the "Check Payment Status" button doesn't work.

I created two identical ERS POs, and moved one invoice over via MRRL and one via MRER to confirm that the MRRL invoice shows payment status.

I found a doc here that says you can use program RMMR1MRR, which is the program behind MRER. I can't paste the link for some reason. Probably because I'm on internet explorer. But if you do a search on that program name, you'll find the article from Dec 2008.

Any ideas?

Thanks,
Seth