Details
"Invalid Master part" message is received during the import operation.
Solution
Found that one of the Drawings (Non-master) data was not having the master component in it, while loading the assembly it shows a "search does not find the component" message.
Once that missing master component was placed in the local folder before import, the message went Off.
Notes and References
Hardware/Software Configuration
Platform: INTEL
OS: windows
OS Version: 10_1909
Product: NX
Application: NXMANAGER
Version: V1892
Function: CLONE_IMPORT
Ref: 001-10031653