3825757 - How do I change the data type of a custom field that has historical data?

I would like to repurpose a custom field and change its data type. However; when trying to do this, I get the error message below:
User-added image

Concur Expense > Unspecified - Expense Concur Request

Concur Expense all versions ; Concur Request all versions

Unable to change the Data Type in Forms and Fields. , KBA , CON-EXP-ADM-FOF , Forms and Fields , Problem

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