After saving an existing NX file in managed mode of NX with Save JT Data option turned on, there is an extra named reference existing within the direct model data set.
This is due to following workflow:
(1) Save from NX with Save JT Data toggle on, this will create the revision with direct model dataset containing only one name reference of MODEL$.jt.
Then exit NX and Teamcenter, and go modify the tessUG.conf file as such:
plus have the environment variable UGII_GENERATE_MULTI_CAD_JT=1
(2) Restart Teamcenter and NX, load that item revision back into NX and make some minor modification, do File > Save, now the direct model dataset will have two named references, the second named reference is the one with above configuration from the modified tessUG.config file, which is 000045_A_Part_2.jt
Notes and References
OS Version: 764SP1