Custom Script Fetch Value From Master

Only for document

cur_frm.cscript.custom_item_code = function(doc, cdt, cdn){
    var child = locals[cdt][cdn];
    cur_frm.call({
        "method": "frappe.client.get_value",
        "args": {
            "doctype": "Item",
            "filters": {
                "name":  child.item_code
            }
        },
        "child": child,
        "fieldname": "soi_size"
    })
}

Solved fetching the value from the server because add_fetch dont work for fields in grid

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