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Shruthi MN 88Shruthi MN 88 

Create only one child record

Use a validation rule on Account where OpportunityChild__c object gets created only one.OpportunityChild__c is the parent object and Account is th child. Account has a rollup count summary feild as OpportunityCount__c. The validation rule works. Incase they deactivate the validation rule and add 6 records then the validation dosent work

OpportunityCount__c  = 2
HarshHarsh (Salesforce Developers) 
Hi Shruthi,
What exactly do you want to achieve can you please explain it more?