A variation child SKU has an association issue with its parent in the catalog.
Why this happens
Error 11003 is documented as an individual entry in Amazon's error code reference. Consult the processing report and the official docs for code-specific root cause.
How to fix it
Read the processing report for code-specific guidance.
Open the official Amazon docs link below for the most current explanation.
Apply Amazon's recommended fix and resubmit the feed.
