Hi Naveen,

Generally the unexposed properties will be stored in the blob column and if you use this unexposed property in the report definition then it will report the guardrail warning related to the performance issue because each time the report is run the data related to that property need to be fetched from the blob column using the UDF's which takes time to fetch the data. So the system will throw this warning to optimize the property to avoid this performance delay.

Hope it is clear to you.

Regards

Mahesh