In case another field has been set as update field in the template, that field will be required.
These are just 3 fields, check the list of Available Fields in CSVI for the complete list.
Explanation of fields
The unique identifier for a product
The name of the product
The full path of the category
The long description of the product
"H01","Hammer","Hand Tool/Indoors","A great hammer to let out all your frustration","Y"