Debit held deliveries

Debit held deliveries count as if delivered, i.e. even if a box is placed on hold that box credit is removed from the total count. Farmers use this to ensure there are no residual credits left at the end of a season. (And therefore no requests for refunds from members.)

What is impact of debit held deliveries on bw-weekly shift forward/back scheduling?

For debit held deliveries, boxes on hold count, i.e. are subtracted from the total. So shifting a BW forward or backwards will use an extra box credit (the held box counts.) To make up for that used credit, go to member subscription, Due/Add Deliveries/direct credit with a memo.