From PO to automatic SO - using EDI

Hello Friends,

I am working on ALE/IDoc scenario, where plant A places a purchase orders to plant B. I want this process to be automated using ALE/IDOC. i.e I want SO to be automatically created when plant A places a purchase orders to plant B.

So far, I have performed following settings:

1. SALE : creation of Logical Sys name and its assignment

2. SM59 : RFC connection & Port Creation

3. WE20 : Maintain Partner Profiles

4. NACE : EDI NACE setting (assign RSNASTED report for EDI_PROCESSING) for NEU output type then

5. I created PO and added NEU output type. I could see the IDOC created When I output type was released..

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Now,

1. I don't understand how system will create a SO out of IDoc created in earlier step?

2. Is there any SD configuration missing from SD  side?

3. is there any Exit involved which converts IDoc created in earlier step to SO ?

waiting for your reply...