Where does the PO number appear in invoices and can I put it elsewhere?

If you define a PO number for a job, this number will appear below the name and the service of the job in the invoice.
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If all the jobs in the invoice have the same PO number, this number will appear only once at the top of the invoice. You can also deactivate this option by unselecting the corresponding option under Settings > Document templates.
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You can also choose to display the PO numbers of your jobs in a separate column in your documents by selecting the corresponding option under Settings > Document templates.
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