Reposition to a different record after the save

I have 3 objects, imported from OpenEdge business entities, with following relationships:

Maindata 1: n Leasespaces 1 : n Invoice items

When I am on a leasespace I can see all it 's invoice items (I am on leasespace with Mandata Id 3003.1):

I want to edit one of the child records (second Invoice item):

After the save I am re-positioned to another leasespace than I was before:

You can see also that by URL's:

Before: rollbase.dev.wereldhave.com/.../main.jsp

After: rollbase.dev.wereldhave.com/.../main.jsp