XVL assembly tree

While using the XVL Studio 3D CAD Corel Edition x64, as we try to relocate bodies or assemblies into the assembly tree (drag&drop) the bodies and assemblies change space position and orientation depending on which is the new parent in the assembly tree. It might be a matter of coordinate system but we can't find out even in the help guide where are the right settings. In other words we want to relocate bodies and assemblies inside the assembly tree without affecting space position and orientation. How can we do it?