These PBOs ship with the mod and load only when the other mod is loaded too (skipWhenMissingDependencies); without it they are skipped silently.
Other mods' 82 mm mortars that use the vanilla mortar_82mm and its rounds (the CUP 2B14, M252, L16A2 and FV432 mortar, for example) need no compatibility PBO: the BCS's Mk6 battery type covers them.
PBO
Needs
Purpose
itc_land_compat_rhs_afrf
RHS: AFRF
ITC versions of the 2S1 Gvozdika and 2S3 Akatsiya (ammunition handler, mounted tablet, ITC sight), ITC sights for the D-30, firing tables and BCS battery types for the D-30 and the 2B14 Podnos mortar (the old ITC 2B14 stays hidden for old missions)
itc_land_compat_rhs_usaf
RHS: USAF
ITC versions of the M109A6 Paladin (ammunition handler, mounted tablet, ITC sight), ITC sights for the M119A2, firing tables and BCS battery types for the M119A2 and the M252 mortar (the old ITC M252 stays hidden for old missions)
itc_land_compat_bwa3
BWMod
ITC versions of the Panzerhaubitze 2000 (ammunition handler, mounted tablet, ITC sight, ITC 155 mm L/52 rounds with German designations), firing tables and a BCS battery type for the MRS120 mortar
itc_land_compat_gtk_boxer
GTK Boxer
ITC versions of the Boxer RCH 155 (ammunition handler, mounted tablet, ITC sight readouts, ITC 155 mm L/52 rounds like the Sholef 2)
itc_land_compat_cup_units
CUP Units (and CUP Weapons)
ITC versions of the D-30 and M119 (ITC sight, no vanilla artillery computer), firing tables and BCS battery types for both
itc_land_compat_cup_vehicles
CUP Vehicles
ITC versions of the M270 MLRS (ITC 230 mm rockets, MLRS sight and mounted tablet, like the Seara 2) and of the M1129 Stryker mortar carrier (ITC 120 mm mortar rounds, ITC sight, firing tables and BCS battery type)