How to Create business rule or Field trigger on Business object
Summary:
Need help to create field trigger there is 1 column in table which is primary key invoice_id and its varchar type when user doing update trigger will validate if that value is exists in system and count is 1 then I want to update the table record and if not then insert new record with same invoice id but I want to append or concat sequence with invoice id like
invoiceid+'_'+1
invoiceid+'_'+2 etc
how to achieve this with help of field level trigger or business rule
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