How to update 'Primary of Measure' for existing item?

Summary: How to update 'Primary of Measure' for existing item? Or create a new item with same name as the existing item. My user create a item with wrong primary of measure and saved, now we need to correct the primary of measure.

Content (required):How to update 'Primary of Measure' for existing item?

Version (include the version you are using, if applicable): 23B

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