use po unit of measure to do stock transfer order

Question:
I use stock transfer purchase order to transfer goods from 001 storage location to 002 storage location within a plant, the base unit of measure is EA, and the po unit of measue is set CS(1CS=100EA) in the material master. when I create PO of stock transfer, CS is prompted for the material as unit of measue, but when I input a number(10 for example) as quantity, it's automatically translated into 1000EA, then I have to change the unit of measure Manually back to CS and also change the quantity again back to 10! what can I do to make it NOT automatically do the unit translating?
Answer:
help!

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