How to send IDocs to "blank" R/3 / ECC system?

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Hello @all,

I am tryng to send IDoc (e.g. ORDERS) from an PI 7.0 system to an ECC system. Both system have been recently installed, they are almost "blank".

I have created the RFC destinations and ports and so on. This configuration part should be finished

Is it now possible to send IDocs to the ECC system, although there are no partners, partner agreements and so on? Do I have to use header mapping in the receiver agreement on PI? What should be configured in the IDoc channel? What should be mapped into the header of the IDoc in message mapping? At the moment I get different error messages on XI, e.g. "could not convert... to an ALE system", "unable to convert sender party to an IDoc partner",...

I know there are several blogs, discussions etc., but I could not find an answer there. The basic question is: Do I have to configure partners and partner profiles in the R/3 system in order to send test IDocs from PI to R/3?

Thanks,

CHRIS