The Magento API and the FarApp Magento extension expect Magento fields to be described using the field's attribute code and not their attribute label. So in order to map the item fields from your backend system (e.g. NetSuite) to Magento, you'll need to use the attribute code value for each field. In order to find the attribute code for each field, please do the following:

1. Log into your Magento admin site.
2. Go to Catalog->Attributes->Manage Attributes.
3. You'll find the attribute code value in the "Attribute Code" column (typically the leftmost column).