Exporting Optimised Lattice Model

Hello,

I have created an optimised model however when exporting it and trying to open with SOLID WORKS only the partitioned parts (which are not the work space) are visible as seen in the images below.

Model in Inspire:

Model when exported as ACIS/IGES/Parasolid/Step:

(Yes I have taken it in Solidthinking however this is what it looks like)

Thank you,

Junaid