Current & Previous in Business Rule
Business Rules often use the current and previous objects in their script logic.
The current and previous object is automatically instantiated from the GlideRecord class.
The current object’s properties are all the fields for a record and all the GlideRecord methods. The property values are the values as they exist in the runtime environment.
The previous object’s properties are also all fields from a record and the GlideRecord methods. The property values are the values for the record fields when they were loaded from the database and before any changes were made. The previous object is not available for use in async Business Rules.
The syntax for using the current or previous object in a script is:
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https://medium.com/@LearnITbyPrashant/current-previous-in-business-rule-d5fd85e50886?source=rss-d005fc598f0a------2