function readOnly(count){ }
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for(Customobject__c obj : Trigger.new) { if(String.isNotEmpty(obj.customPicklistField__c) && obj.customPicklistField__c.split(';').size() > 3) { obj.addError('You can not select more than 3 values in pick-list'); } }
Here is demo code for same.
Please let me know if this works.
Thanks