The S_VSES_REINSERT does not work when using with uxins to insert a different version of the session on the same area.
Ex.
[username@servername bin]$ echo $S_VSES_REINSERT
002
[username@servername bin]$ ./uxext ses ses=BTASES001 app output=SEVERSION000.txt
Object (Session, BTASES001, 001) has been extracted.
[username@servername bin]$ ./uxins ses app ses=BTASES001 input=SEVERSION000.txt
Object (BTASES001, 001) already exists.
No element has been imported.
Object already exists error
Command uxins in error.
[username@servername bin]$ ./uxins ses app ses=BTASES001 vses=002 input=SEVERSION000.txt
No element has been imported.
Release : 6.10
Component : DOLLAR UNIVERSE
N/A
It is by design that it is not possible to insert a session object with different version in the same area(ex. Production).