bug补齐

app/service/material_list.js

@@ -278,6 +278,7 @@ module.exports = app => {
                     mx_id: ml.mx_id,
                     gather_qty,
                     quantity: ml.quantity,
+                    expr: ml.expr,
                     is_join: ml.is_join,
                     in_time: new Date(),
                 };