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- A field used for operational, Data Cleaning purposes only.
- A field used to collect data that have Direct Mapping to a target variable in the tabulation dataset.
- A field used to collect data that has have No Direct Mapping to a target variable in the tabulation dataset variable.
Prior to adding a custom field to a CRF, confirm that none of the collection fields in this guide or in the CDASH Model fit the need.
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