SAP中CHANGE VALUATION CLASS更改评估类
The valuation class of a kind of material which was used in the system is wanted to be changed now. If you use t-code mm02 to change the valuation class directly, the system will give you the error message, and reset automatically. 已经有业务记录的物料号，现在需要更改评估类，使用MM02直接修改时，系统有错误提示，并且自动重置，看了一下帮助文件（真是个好东东）。
Procedure处理方式如下：
1、Ensure no stocks by now.If there are stocks,goods issue then reserve.确定到目前为止无库存。如果有库存的话，只能先出库再冲销吧；
2、Flag all po deletion ,including open po and close po.所有的PO删除：这里包括两种情况：未结的PO和已结的PO。
If the po is closed,maybe archive is ok,but this way is not tested.如果是已结的PO，估计归档后也可以（此种方式未测试，我们公司所有的文档都没有作归档），好像光是冻结也不管用。
If the open po has some subsequent business,you must procedure like this:PO-GR-IV, otherwise, you could not do it. Only the po has no later business could do.未结的PO如果有部分后续业务还未处理完毕，也不可以删除，必须PO-GR-IV全部完成后才可以删除,只有是仅下了PO的单子才可以删除.
3、Now, you can change valuation class (If there are product po,sorry,i don't know~~) 这时就可以修改评估类了。（如果有生产工单时，偶就不知道了~~）
From below, i test the unit of messure whick could do like the same, but you should change the other master data, like info record ect.经上述启发，偶试了一下计量单位，也可以按如上方法处理，只是还需要到相关的主记录，如采购信息记录中手工修改单位即可。
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