X-ray pelvimetry is indicated in all of the following conditions except
The main aim of X-ray pelvimetry is to:

To confirm the diagnosis of contracted pelvis if it cannot be confirmed clinically
To rule out CPD.

Severe CPD can be diagnosed clinically and trial of labour is not indicated in this case. It is managed by elective cesarean section therefore, there is no role of X-ray pelvimetry.
For those who feel breech presentation in vaginal delivery should be the answer, read the following lines from
Callen USG Obs and Gynae 4/e, p 729
“Although pelvimetry is no longer commonly performed, it is beneficial in patient who desire a trial of labour when the fetus is in breech presentation”.
Severe CPD
Breech presentation in vaginal delivery
Outlet obstruction
Osteomalacia