Stank1964,
Thank you for your suggestion, it would certainly be a good idea; I will likely implement it. However, I would also like to understand JD Edwards' natural process for processing 850 transactions and generating 855 and 810 files.
This is a huuuuge topic and involves lots of work in my experience. You're best off hiring in a consultant who has experience in your specific document sets (and make sure to specify inbound/outbound for each transaction set you need)
The best documentation is within the cross product EDI Interchange doc, such as
https://docs.oracle.com/cd/E16582_01/doc.91/e15100/rcv_n_snd_edi_so_docs.htm#EOADI00284
This has quite little about HOW to arrive from your inbound file with pipes to get to the F47 files required by JDE to process the transactions and move them into your live transactions. There are 2 facets going on. The first is kind of easy for those of us techies, and the 2nd is for someone with lots of functional and configuration experience (a consultant)
First you're loading what is probably a text file from a FTP location. Great. You could do this step via orchestration, or go old school and load the file into your JDE filesystem, then use a table conversion UBE to parse out and place the data into the F47 files. The choice depends on your comfort level. JDE doesn't have a native "EDI gateway" like you might find with integration platforms such as boomi. You need to do the final mile of the flat file to your EDI F47* files on your own. This is probably why you aren't having much fun finding documentation.
The 2nd part, which is "now the data is in the F47 files, and I'm ready to process those to create official JDE transactions", requires lots of configuration of the F47* AND F42* UBEs and Programs. So it's important to get it right, and if your inhouse staff aren't comfy here, you should really hire a consultant. I've never used the P47* suite. I think it's fine if you need to do manual massage on a case-by-case basis, but I used the batching stuff way more
I will say, the F47/R47 file process is great considering how old it is. I've used it for EDI as well as e-commerce sites, UPS shipping integrations, etc. It's pretty rock-solid once things are set up.