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Integrate > Service Manager integration methods and tools > Event Services > Mapping events > Using event maps > Rules for building maps
Rules for building maps
For best results when building new maps that use array fields, follow these guidelines:
- Select the first instance of any array fields (such as user.array in the mail file) so the proper type is built for the field.
- Only scalar and array fields can be directly mapped; all other types must be manipulated using expressions.
If possible, build maps first and then design external applications to use the maps.