Ok,
found the solution to this particular problem:
1- import the lib project in CCS
2- select the build configuration needed (what is the difference between C67p_elf and C67x_elf???)
3- tick the --target_compatibility_6200 under the Runtime Model Option
4- rebuild
5- link in the project the new lib and update the search path.
The project buids and links ok, however it does not pipeline...(but I will open a new thread for this one)