%dw 2.0
output multipart/mixed boundary="---------------------------9051914041544843365972754266"
---
{
    parts : {
        field1 : {
                headers : in0.parts.field1.headers - "Content-Disposition" ++ {
                    "Content-Disposition" : {
                        name : "field1"
                    }
                },
                content : in0.parts.field1.content
            }
    }
}