CRA is questioning an Additional Deductions claim. How do I find where that originated?

How can I find the origin of a claim of Additional Deductions on line 256?

Troubleshooting

Please see as per CRA line 256- Additional Deductions- to see which you may have claimed- https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...

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