This field is initialized by the validated main mandate of the company/pay-by BP combination, but it can be modified.
Only a mandate reference whose status is "Validated" can be entered.

- If a Unique Mandate Reference has not been selected, and the payment method is SDD, a blocking error message appears:"Mandate reference not defined") (the mandate reference is a mandatory data for a SDD payment method).
If the payment schedule is modified, the mandate reference must be entered, if necessary, inthe open item management record. - If the company is modified for a company that does not manage SDD, the mandate management column is not displayed.
- It must necessarily be a BP customer invoice (and not supplier).For supplier BP invoices, the SDD method is still possible, but the mandate reference is not accessible.