EDI for 856 inbound
Please help me how can I add a new field in EDI for 856? I'm not a EDI/IDOC developer. I have a need to add a new field for incoming 856 EDI. I found a field in IDOC to map my requirement, but my EDI/IDOC developer is asking me where do we map this in EDI? Could some-one help me identifying an existing field or adding a new field to EDI? What's the recommendation? Please help me on this.
Appreciate your help.