Mold tool

Hi,
I've one problem with this tool on multi-body.
I would like to create core and cavity bodies to export into anassembly and create my moldbase with MoldWorks.
Parting Lines are created without problems.
Shut-off Surfaces that to the end close holes and create cavitiesand cores surfaces, it does on 'Gancio1', but not on 'Leva'.
Someone can help me to understand why and maybe give me somesuggestions or different method to create core and cavity bodies ?

Thanks,
AlessandroSolidworksSurfacing