This drop down combo is visible when the "Method" buttons are set to:
(Part Only) and (Explode), where the Maintained
Parent is the part number of the parent to which the component in the
Available Parts list box is to be linked; or
(Explode) and (Explode), where the Maintained
Parent is the part number of the parent to which components selected
from Available Components, when "Same-As Adding is done, can be
linked.
Take note that when a Project specific Bill of material is to be added,
the Maintained parent and reference parent will be forced to be the
same, since a Project specific BOM must be created by copying the
standard BOM as the baseline for the Project BOM.
You thus have to select the standard BOM part number as the Reference
parent and it will be defaulted as the maintained parent part.
After the BOM has been copied, the project BOM can be maintained
to differ from the standard BOM.
It is populated with all Part Numbers, Descriptions, Source, Fixed
Account and Serial/Lot Control from the Part Master
table.
The number of characters to be entered before the list is shown is governed
by the value of "populate length" (mandatory).