No boundary conditions listed in PSD G Accel load in Random Vib (Ansys Mechanical)

[cbk14]

I'm having a strange issue where I can't select any boundary condition for my PSD G acceleration load in a random vibration study. I have the prerequisite modal analysis linked properly, with fixed boundary conditions defined therein, but the PSD G acceleration definition doesn't list them, nor does it allow me to select them in any way. Pic attached.

Any ideas?

 

[cbk14]

OK I'm an idiot. I was using body to ground joints above. Even though they were 6-DOF fixed joints, Ansys won't use those for a PSD G Acceleration boundary condition. Even though I was able to run the modal no problem. I needed to define Fixed Supports in Modal using right click > Insert > Fixed Support