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This will create a feature request which anybody can view and comment on.

Please describe your requested enhancement. Good feature requests will solve common problems or enable new use cases.

Problem you have encountered:
When a customer attempts to update information using the Patch method in Retail, the API returns a 400 HTTP error with the message "Unsupported path 'XXX' in 'product.retrievableFields'".

What you expected to happen:
The expected outcome is that the update will be successful without errors, as "retrievableFields" has been deprecated [1].

Steps to reproduce:
Try to update information on “updateMask” without adding “retrievableFields”

Other information (workarounds you have tried, documentation consulted, etc):
Include the "retrievableFields” within the "updateMask" field after specifying the parameter you intend to update.

Documents:
[1] https://cloud.google.com/retail/docs/reference/rest/v2/projects.locations.catalogs.branches.products#Product.FIELDS.retrievable_fields