Problem converting SW2017 file to IFC2x3 for opening in Tekla Bimsight

I need to send a detailed steel frame file to my subcontractor in IFC format.

I've already done this in the past with SW2015 and everything was going well. I had as many bodies in SW2015 as I did in Tekla.

Today, with SW2017, when my subcontractor or  I try to open it with Tekla Bimsight, the whole thing is converted into 1 body. So it's very complicated to work for him and for me.

Do you have a solution so that I can send my subcontractor a multi-body frame with SW2017 and its options?

Hello from memory it seems to me that it should be saved in . Sat and then reopen it on SolidWorks. This is Tekla's problem in addition to the veneers on the tubes. 

Kind regards.