Field help (CDADEP) 

This field can only be accessed for 'Account <=> BP' payment attributes and it makes it possible to have the early discount/late charge calculations available upon manual entry of payment lines.
This concerns only the reconciled open items having an early discount/late charge code, and for which the variance between the payment date and the due date justifies that these expenses are taken into account.
Thus for this open item type, entering an additional early discount/late charge line to a payment attribute ticked 'Early discounts/late charges' triggers the calculation of the Early discount/Late charge set up for the corresponding invoice rather than the open item closure proposal.