Difference between Lookup Filters and Validation Rules in Salesforce
Validation rules and lookup filters both are very similar, but offer different advantages.
Use a lookup filter:

You want to improve user efficiency by limiting the number of available options in a lookup search dialog.
You want to improve user efficiency by automating filters on lookup search dialogs that your users manually set.

Use a validation rule:

You’re close to the maximum number of lookup filters allowed.
You must implement a complex business rule that requires you to use a formula. Formulas can reference fields that basic filter criteria can’t reference, such as fields on the parent of the source object. Formulas can also use functions. For example, use ISNEW if the rule should only apply on record creation, or ISCHANGED if the rule should apply when a field changes.

Written by 

I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

Leave a Reply

Your email address will not be published. Required fields are marked *