I'm trying to create a custom record from transaction using create record workflow action. I am able to create the records, for example, on sales order create, but I can't get the field on the custom record that links back to the transaction to populate. I've used, in the past, the selection column to choose <current selection>, or a formula value of {id}. That does not seem to work for transactions. Does anyone know the formula I should use to link a newly created record to a transaction?