Manufacturer troubleshooting

Goal

Unblock common manufacturer errors.

Steps

1. If save returns 422, read the validation message.
2. Confirm permissions (catalog.view / catalog.manage) and module entitlement.
3. Recheck required master data from setup.
4. Escalate with the exact error code when stock/tax/period rules block you.

Hard stops

Validation 422 on empty default-locale name; duplicate code.

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