2022
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Reason : Since there is only insert/no update sequence for invoice in OpportunityToInvoice workflow.
Solution:
Change the invoice sequence from ‘insert’ to ‘upsert’ .
Make sure that ‘Id’ is primary key.
Inside mappings, target field<Id> shouId be mapped with “IF(ISEMPTY(VALUE("AVSFQB__Quickbooks_Id__c")),"",VALUE("AVSFQB__Quickbooks_Id__c"))”
Save the workflow.