Restriction on item Attribute Update

Summary:

User wants to restrict item attributes from getting updated.

Content (please ensure you mask any confidential information):

User is importing item from third application. User have a requirement where they would like to restrict/block item attribute from getting updated in Oracle Fusion. User wants to

For Ex:   Item attributes "Purchased" and "Purchasable" should be restricted/blocked from getting updated both at Master Org level and Child Org Level in Oracle Fusion.
Any help in this regard will be highly appreciated?

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