I had the problem that WOK from OpenCASCADE6.3.0 did not work for me. Luckily someone else fixed it for the Debian packages. I just don't know if it has been reported upstream as there was no mention in the forum.
P.S. Special thanks to Denis Barbier for fixing
Fix WOKStep_Extract::Execute
This step did put garbage into generated file, because a pointer was used
after it has been freed.