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nusrat khowajanusrat khowaja 

new lead validation

Please help me  to create a validation rule for this task. Does this task can be done without tiggers , or the only way is to write tigger for this task."
When a new lead is created, check if there is an Account record that already exists (based on the company name)
if the account exists, then check the box for the field called "active lead" in the Accounts object"