This is basic. Send 23.98 sequence from Fcpxml, Resolve sends 24.0 XML to fcp7.

[Robert Due]

I found this solution that worked for me. Look at the last post on the thread.
https://forum.blackmagicdesign.com/viewtopic.php?f=3&t=6147

Robert Due
Editor / Colorist
INDEPENDENT EDIT
DaVinci Resolve 9.1.1
OSX 10.7.5
MacPro 8-core 4,1 2.93 Ghz
8GB RAM
Nvidia GT120 GUI
Cubix Expander with 2 x GTX570 (CUDA 5.0.36)
Decklink Extreme3D+
Panny BT-LH1710P/ Panny BT-LH2600W
Tangent Wave