Datamolino captures a currency that is written on the invoice. If there is only '$' sign on the invoice, Datamolino captures the currency that is set as default for your folder (the system is unable to identify if it is USD/NZD/AUD/SGD dollar). 

To make sure that the currency is correct, you can set the currency individually per supplier in the 'Supplier Automation' dashboard. 

If the currency is not included within the invoice, Datamolino uses the default currency pre-set in your 'Folder Settings/Supplier Automation'.