Details
A monolithic (one file) JT includes an structure that can be called "Assembly Structure" as know from NX.
In NX no structure shows up.
Solution
NX Support for this Format Type
MONOLITHIC
NX does not import the structure for these files. Instead, the assembly structure is collapsed into a single part file.
Notes and References
https://docs.plm.automation.siemens.com/tdoc/nx/1847/nx_help/#uid:interoperate_pv_jt_assystructure_rt
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: GATEWAY
Version: P1899
Function: OPEN_JT
Ref: 002-8014091