You can perform an error analysis in the transformation in the following ways:
You can check whether the source values are updated in the target using the single rule test. For more information, see Testing Rules.
With the function Simulate and Debug DTP Requests, you can simulate a transformation prior to the actual data transfer to check whether it returns the desired results. You can set breakpoints at the following points in time during processing: before the transformation, after the transformation, after the start routine and before the end routine. For more information, see Simulating and Debugging DTP Requests.