Hello,
Valid joint conditions are defined in JOINTS.INI file (PROJECT_ROOT\Config\modules).
BWT (HiPurity Butt-Weld) could be connected with BWT or CPM end conditions. The Base module does not have BWT end condition defined in PORTS.INI for pipe ports. If the end conditions for pipe are not defined in specification and PORTS.INI is not defined to read end conditions from specification, add BWT end conditions for pipe ports in PORTS.INI.
As well BWT is used in HiPurity module and it is defined in C:\Program Files (x86)\Bentley\Plant V8i\Modules\HiPurity\PORTS.INI
Just in case, please try to load Hi Purity module and check it functionality, it could that it will fit your requirement.
I hope this information will help.
Regards,
Artiom