Extended Properties Permissions Issue

Hi Team

I have configured extended properties for Part Item type and I'm able to select and add the xProperties in Part item using super user. But when I try to get / add xProperties using normal user, I was not able to get or add the xProperties. 

I'm getting the below error

You have insufficient permissions to perform 'classify' operation for item id '46F261DDEDEA40F784EA2C51687BB519' by xClass id 'F4C365C728574ADEAE8EB1C4E5A50D25'.
Attached screenshot as normal user and super user for reference. Do I need to add permission anywhere to see / add xProperties on Part as normal user ?

Thank You