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Adam JohnsonAdam Johnson 

Create a validation rule that does not allow me to generate 2 activities of the same type.

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Dharmendra ShekhawatDharmendra Shekhawat
Hi,

You can do this by creating a unique field + workflow rule + field update combo. Here's a blog post that takes you through it step by step:
http://focusonforce.com/configuration/preventing-duplicate-records-with-salesforce-config/

Remember that you will need to unique fields and two workflow rules +field updates for both Task and Event objects.If you need to check for uniqueness across the whole of Activities combined (Tasks and Events), only an Apex trigger can do this.


Thanks,
Dharmendra