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What are Indexes?

Answer:

To write valid extended rules, you must understand how to use indexes. Without indexes, it is possible that a rule which moves data from one field to another may result in lost data.
An index is a number that is used within an extended rule only when referencing a field contained by a repeating record or group. This number is used to specify the exact occurrence (iteration) of the repeating group or record that you want the translator to access.
When you are mapping the data from one group of data to other group we have to use the indexing to map the correct sequence of data

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