A BOM can have several pending changes. Depending on its
effectivity, you may need to release one change before another, that is, the
first change is a prerequisite of the second. You can set prerequisites
manually, or in some cases, the system will set a change as a prerequisite. For
example, the first change is intended for parts 1-50 and the second change is
for parts 1-5. The first change must be released before the second change.
Multiple pending changes can be created in any of these ways:
Removing one or more parts from the
BOM.
Replacing a part in the BOM with either a new part or an existing
part.