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Change of Physical Product 
You can use this function to exchange the product at the customer site – if a machine has broken down, for example – as well as to change the service product.
Enter a dismantling reading for the old device and an installation reading for the new device. Define a validity date for the change. If necessary, terminate the pool linkage.
The change process takes place at item level.
This change process is defined in Customizing under the technical name UCPP.