Have been using
temple_of_horse_shrine requires factions { huns, }
..............
temple_of_horse_temple requires factions { franks, saxons, empire_east, empire_west, huns, sassanids, } and not hidden_resource nothere
to allow other factions to build on existing temples using nothere dodge to allow out of sinc building tree as on post #133 EDB discussion
https://forums.totalwar.org/vb/showt...t=50039&page=7

Is anyone else actually using that double negative thingy in a mod and have they had any problems??????

Was all working fine till I made some alterations to strat and regions when it started crashing on attempting to view city which had the first temple in EDB with the nothere requirement. To cut a very long story short;

Problem was removing lombardi faction from descr_strat (and regions) (and yes I am remembering to delete the .rwm). Only thing special about lombardi is that they are last faction in sm_factions. I reversed order of factions in sm_factions so slave are last and all works OK again (although its now giving different building pictures - haven't really looked at changing them yet so not sure which version is giving 'correct' pictures!)

It appears to be quite happy and stable now but I'm worried that as I don't understand how relationship between those files was causing problem in the first place - I don't know if future changes could make it buggy again!