If I just specify ImportServer then the WS gets inported, but if I also
specify the policy I want to use:

cn=ServerPackageManage:General:Workstation Import.o=SPGS.c=UK

then I get an error as in subject

If I select policy as:

ServerPackageManage:Workstation Import.SPGS.UK

then it works

Everywhere it is written to use :General (and also using Full Dist Name
cn=..... does NOT work)

Anybody knows why?