Scenario
There are instances when implementing a CSV Import, the field needed on the File Mapping is not available in the list even if it is a Standard NetSuite field.
Solution
To fix this, kindly verify the following setup:
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Navigate to Customization > Forms > Entry Forms
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Edit the customized form
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Go to Fields tab > Look for the field missing then set the Display Type = Normal and mark Show
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Save changes
Note: Repeat the process of Import from the start to let the changes propagate.