The pegging part number is specified whenever the need exists to only view requirements pegging to orders that replenish the selected pegging part.
Specifying a pegging part will therefore limit the display of requirements to only include requirements linked to order lines where the pegging part number is equal to the order line part number.
You are performing a supply demand analysis on a common part like a nut or bolt. The item is used in the manufacture of various products/end items. Should you only wish to view the demand for the assembly of bicycles, the part number of the bicycle needs to be entered in this field.
The number of characters to be entered before the list is shown is governed by the value of "populate length". When View Requirements is not checked, this field is disabled.