SAP MM 启用批次管理的物料MB21创建预留单据时批次号可以为空！
如下预留，
批次号字段为空。
实际上该物料是有激活batch
management的，
For MB21, it is just material reservation, no posting required, so batch field is not mandatory, Batch can be specified during posting manually or automatically.
2018-09-26 写于杭州市。