I just loaded up my old personal mod that has both of those mods and had a 3-way battle between me vs. IDH vs. Steel Legion. Worked just fine. So I don't think that is your problem.
Try making a folder called My_Mod and a file My_Mod and save it as a module (use notepad) for the text in the file put this in
Code:
[global]
UIName = A quick mod
Description = $16021001
DllName = WXPMod
Playable = 1
ModFolder = My_Mod
ModVersion = 0.01
TextureFE = Art/UI/Textures/Title_winter_assault.tga
DataFolder.1 = Data
ArchiveFile.1 = IDData
RequiredMod.1 = objective_points_SS
RequiredMod.2 = Inquisition_Daemonhunt_SS
RequiredMod.3 = Steel_legion_DC
RequiredMod.4 = DXP2
RequiredMod.5 = W40k
Worked for me, just tried it.