When turned on, this will allow for sales order line items to be 'part' picked. When used in conjunction with back order, Sync will then place the remaining line item units on back order on the same sales order, and move the current sales order line to picked.
If break line is not used, then the user will have to wait until there is sufficient stock to fulfill the entire sales order line item, or manually enter in the units to be picked for each size that has units available.
If break line is used, but not in conjunction with Back order, then the line item will be part picked (line item status moved to picked) and will not be able to picked in its entirety. A new Sales Order will need to be created to fulfill the remaining units.
Process to follow would be to turn Break line on, then select Auto Allocate. Finally, to pick the available stock and place the remainder on back order, click 'Back Order'. This picks the available units and ticks the back order check box. This will allocate the available units to the Picking Requisition and place the remainder on Back Order.
Note:
Business Rules involved:
default_break_line_pstock_requisistion - defaults the breakline setting to 'On'
automatic_back_order_creation - defaults the back order setting to 'On'
default_back_order_header_action - determines if a new Sales Order is created for the back order, or if a new line is added to the same sales order.