I am using the above formula but getting an error.
I understand I have to look into SYS07 Module(Distribution Center Details) for Default Shipping Line item looking up SYS08 SKU Details'.Code and SYS08 SKU Details'.Supplied By ..pls guide
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Please use Square brackets  in your formula.
Source.Item[LOOKUP: Mapping A, LOOKUP: Mapping B, LOOKUP: Mapping C]