# Does the API validate fields per form type during bulk-upsert?

Source: https://developer.avalara.com/products/avalara-1099-and-w9/integration-guides/1099-and-w-9/zqa0169190421811/

Guide: 1099 & W-9

# Does the API validate fields per form type during bulk-upsert?

Learn how the API validates fields based on the form type during bulk-upsert.

The API validates required fields based on the `formType`. The system ignores fields not relevant to the declared type. The system flags forms with missing required fields during retrieval or UI review, not during submission.