If you use generic BVH files then it is often a hit or miss situation because the naming convention may be different (ie right leg may be rleg, or their may be an extra body part such as torso and chest, where your character may not have, or it may refer to waist instead of hip)

But if you go to sites that create BVH or FBX for Poser/Daz characters then you will have better results

MIXAMO.com you can create your own custom motion files and they use Daz figures and you can also upload your own custom character to create motion files for a cost

es3d.com  have good motion files for Poser/Daz figures

SKAmotion.com is another place for Poser/Daz figures

plus these sites have some free motions as well

You might as well PAY attention, because you can't afford FREE speech