  Light front wave functions (LFWFs) are often utilized to model parton
distributions and form factors where their transverse and longitudinal momenta
are tied to each other in some manner that is often guided by convenience. On
the other hand, the cross talk of transverse and longitudinal momenta is
governed by Poincar\'e symmetry and thus popular LFWF models are often not
usable to model more intricate quantities such as generalized parton
distributions. In this contribution a closer look to this issue is given and it
is shown how to overcome the issue for two--body LFWFs.
