- Added permission checks to ensure that only the creator or an admin can modify existing shipping plans.
- Updated SQL queries to include the creator's information for better tracking and management.
- Implemented merge mode functionality in batch saving of shipping plans, allowing users to choose between merging with existing plans or creating new entries.
- Enhanced user experience by providing clear feedback on the status of shipping plan operations and conflicts.
(TASK: ERP-node-XXX)
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