A Picklist field on an object is not available as a lookup field.
The affected picklist field is marked as a searchable object.
If the Searchable Object Field feature is enabled, any object field that is marked as a searchable object field cannot be used as an available lookup source field.
Please open a ticket with Veeva Support to see if the Searchable Object Field feature is enabled in the affected vault.
Vault Object Field Documentation: Field Types & Restrictions
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