- Added `updatePkgUnitItem` and `updateLoadingUnitPkg` functions to the packaging controller for updating package unit items and loading unit packages, respectively.
- Implemented company code filtering to ensure data integrity based on user permissions.
- Enhanced error handling for missing fields and data not found scenarios.
- Updated the packaging routes to include new PUT endpoints for these update operations.
(TASK: ERP-node-XXX)
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