Overview

Error 90003904 is a common listing validation error that Amazon sellers encounter when creating or updating product listings. This error triggers when a required attribute field doesn't contain enough values to meet Amazon's minimum requirements. Understanding what causes this error and how to resolve it can save sellers significant time and frustration during the listing process.

Key Points / What Sellers Need to Know

• Conditional attributes trigger this error — Certain product fields become mandatory based on other selections you've made in your listing. If those dependent fields are left empty or incomplete, error 90003904 will appear.
• Cost and currency formatting matters — Submitting cost amounts or currency codes in an invalid or incompatible format can also trigger this error, even if the field technically has a value.
• Minimum value counts are enforced — Amazon requires a specific minimum number of values for certain attributes. The error message will tell you the exact minimum needed via the min_occurrences variable.
• Feed processing reports identify the problem field — The specific attribute causing the error is documented in your feed processing report summary, making it easier to pinpoint exactly what needs fixing.

How This Error Occurs

Error 90003904 is fundamentally about incomplete data. When you submit a product listing, Amazon's system checks whether all conditionally required fields have been properly filled out. These conditional requirements depend on the values you've selected elsewhere in the listing. A straightforward example is clothing listings: if you select a multi-pack option, Amazon then requires you to specify the pack quantity. Leaving that quantity field blank or providing fewer values than the system expects will immediately generate this error. The same logic applies across many product categories where one attribute selection creates a dependency on another.

Common Causes

There are two primary scenarios that lead to this error. The first involves conditional attribute requirements that sellers may not be aware of. When you select certain values for one field, additional fields become mandatory, and it's not always obvious which ones. The second scenario involves formatting issues with cost amounts or currency codes. If you're submitting pricing data through a feed file and the format doesn't match what Amazon's system expects, the validation will fail with this same error code. This is particularly common when sellers use spreadsheet programs that may auto-format numbers or currency symbols in unexpected ways.