Fields allows you to return a subset of the default fields (comma-separated list).

Supported fields:

• data_type: Data type enum (0=unknown, 1=text, 2=number, 3=enum, 4=string, 5=observation)
• defaults: Default values for this field
• guid: Entry GUID
• id: Entry ID
• key: Field key/name
• node_id: Component tree node ID (if the entry is scoped to a specific component)
• parent_id: Parent entry ID (for nested fields)
• product_id: Product this entry belongs to
• supplier_id: Supplier ID (populated if supplied)
• type: Entry type (0=expertise variable, 1=asset field)
• values: Allowed values (used with enum data types)