Some of the limitations have been explained previously, but let us summarize them here:
- By default, only a maximum of 20 fields can be tracked
- For Text Area (Long), Text Area (Rich), and Picklist (Multi-Select) type of field, you cannot track the original and new value
- Not all standard objects can be tracked; for example, User, Task, Event, Campaign, and Quote
- Not all fields can be tracked; for example, the Formula field, Roll-Up Summary, auto-number fields, Created By, Last Modified By, and Expected Revenue fields on Opportunity