After installing Plex release r7.3.0 and trying to login to all the library paths we can't find the ClassLibs that contain OBAS400 etc. In the Class730 folder. We only get the following libraries.
Release 7.3.0+
Components: CA Plex
As part of the Plex r7.3.0 installation, one must check/select 'Class Libraries' option to implement OBAS400 libraries. If option was not selected, rerunning the setup program and checking the 'Class Libraries' option is required as shown below.