Good afternoon, when you save as, an IMAN_based_on relation is created between the elements, so you see the relation between these elements
You can see it on the Impact Analysis tab if you create the parameter WhereReferencePOMPref=1 in Edit -> Options...
This is an OOTB relation, I think this relation is needed to track which object a new object was spawned from.
It is also used by some Teamcenter modules. Examples:
You can also watch this topic:
Some industries use this relation to trace the origin of the "problem" in case of investigation of part failure to see where the "problem" originated
It shows reference to the parent item from which save as item was create. Users may refer parent item to understand what all the changes that have been done to the child item.