Good question, I never touch such scenario before as well...yet, I am thinking since your IDoc is from external system, firstly, you need to figure out the Idoc type and information/formatfrom external system to send to sap, maybe you can try to set up inter-company auto AR clearing process via outbound/inbound,from outbound output, you can get the sense of Idoc file..., then you can design the remittance...
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