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When using the Define Mapping option in the Shapefile to Coverage and Coverage to Shapefile tools, the following warning appears:
Duplicate fields not allowed. Field name replaced with: item_1
The Define Mapping option on the these tools will not allow duplicate item names in the output dataset.
Accept the default item name, which the tool provides in the warning message.
If the specified item already exists, the characters _1 are automatically added to the output item name. After conversion, the output item can be changed or deleted in the output coverage or shapefile.