Central AP Invoice Payment Setup

Hi all,
I have been testing the setup of Central AP Invoice Payment in a test environnement following the Multi-Site Company Setup Technical Reference Guide and I can’t seem to make it work.

In my child company, when I post an invoice with Central Payment checked, the AP Intercompany account shows as for the A/P account (so I’m guessing it sees the External Company GL Control Code), but nothing happens afterwards. I was expecting another invoice to be posted into my parent company, and an adjustment transaction to be posted so we see that the original AP invoice will be paid by the parent company.

One thing I noticed in my child company is that I can’t put any value into Invoice Group Prefix in the Central Payment section of the External Company Configuration. I could do it in the Parent company.

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Any idea as to why the interco transactions don’t work?

Thank you!