How to import AR transactions providing a "fixed target" due date not depending on transaction date

Summary:

For rent invoicing, we've been asked to import transactions from an external billing system that would provide a "fix" due date. This due date is not calculated as it depends on contract meaning that this date does not depend on transaction date.

Is it possible to import transactions through autoinvoice providing a "fix target" due date? or is there any workaround to do so?

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