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Prajwal H RPrajwal H R 

Validation rule for Restricting User Creating Again Same Record in an Object for Next 30 days

VinayVinay (Salesforce Developers) 
Hi Prajwal,

Review below link which can help you.

https://focusonforce.com/configuration/preventing-duplicate-records-with-salesforce-config/

Also to handle 30 days filter criteria try to create a new field checkbox and uncheck with time dependent workflow or process builder after 30 days and include checkbox field condtion in formula.

Also you can use Duplicate management rule for immediate action i.e prevent duplicate record creation/

https://help.salesforce.com/articleView?id=duplicate_prevention.htm&type=5

Hope above information was helpful.

Please mark as Best Answer so that it can help others in the future.

Thanks,
Vinay Kumar
SSP AdminSSP Admin
Hello Prajwal

It looks like our team of experts can help you resolve this ticket. We have Salesforce global help-desk support and you can log a case and our Customer Success Agents will help you solve this issue. You can also speak to them on live chat. Click on the below link to contact our help-desk. Trust me it is a support service that we are offering for free!

https://jbshelpdesk.secure.force.com

Thanks,
Jarvis SFDC team