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Trigger to prevent duplicate records in related list

Hi ,


I need to prevent duplicate records in related list.

For eg I have a custom object Quote

Quoteline is a related list for Quote object.

In quoteline i need to prevent product which has been already added in quoteline for the particular quote.

Can anyone help on this.

Thanks in advance.




Hi, What sort of help are you looking for? 

any answers for this please? as i have similar issue for custom obejcts.