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sumit pawarsumit pawar 

how to create trigger for validation error?

i have 3 objects project,saler,recordupdates

project object having level name picklistfield and having values a,b,c

i have records in recordupdates object which contains level name and field name

and now i want to set validation for saler object fields...on which fields are in recordupdates object records.

Please suggest...
Example is below highlighted.
create trigger TR_account (after insert,after update)
for(Account sObj : trigger.old)
                                                   sObj.addError('validation message');