This error means that Finvoice Multiple format can't be sent with manual sending. Most likely in this situation Finvoice format has been chosen in Connector, when sending format should actually be Finvoice Multiple. Finvoice Multiple should be always chosen if finvoice file includes more than one invoices.
NOTE! With this option you can't send attachments with invoices.
Finvoice Multiple can only be sent with automatic sending, which means that the xml-file needs to be saved in OUT-folder where Connector will read it and send it automatically.
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