Unable to make Maiden Name a non-Lookup field

Maiden name is a Lookup field in Config > Fields > Constituent. 

When I try to unmark the Lookup box to make it a Text field, the Lookup box is grayed out. 
Contact Support and provide this solution ID. 

Steps to Duplicate

Go to Config > Fields > Constituent. 
Under Maiden Name, attempt to unmark the Lookup checkbox. 
The option is grayed out, and the field is unchangeable. 

Environment

 Raiser's Edge

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