Specifies the codeunit that prepares the mapping between fields in Microsoft Dynamics NAV and external data.

After processing in the Validation Codeunit, exported data is processed in the Pre-Mapping Codeunit prior to mapping.

After processing in the Reading/Writing Codeunit, imported data is processed in the Pre-Mapping Codeunit prior to mapping.

The mapping definition is stored in the Data Exch. Mapping and Data Exch. Field Mapping tables.

For more information about the structure of objects in the Data Exchange Framework, see the diagrams in About the Data Exchange Framework.

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