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How to use fields of a object in lookup filters which is not from a target lookup object and even not the current record (Source)?
How to use fields of an object in lookup filters which is not from a target lookup object and even not the current record (Source)?
You should look at customizing your lookup filter
I recommend taking a look at Jeff Douglas blog post for sample code
Let me know if this helps, if it does, please mark this answer as best so that others facing the same issue will find this information useful. Thank you