How to create Work Requirement for Asset not tied to an Item in Maintenance Program

Summary:

We have a requirement where assets have been created without referencing an item.

When trying to create Work requirement for this asset in Maintenance Program, I am unable to search for this asset.

I am unable to see the 'Allow Maintenance Program' and 'Allow Work Orders' check box in the asset as well.

How can I create Work Requirement for this asset?

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Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):