Corrected tierup condition

common.eai

@@ -11693,7 +11693,8 @@ function OneBuildLoopAM takes nothing returns nothing
             call Trace("NO RESOURCES " + logtype + unitNames[id] + " " + Int2Str(id))
             set tracednoresources = id
           endif
-          if tp == BUILD_UNIT and (ret == CANNOT_BUILD or ret == BUILT_SOME) and qty < build_qty[index] *0.75 then
+
+          if tp == BUILD_UNIT and Max(TownCountTown(id,build_town[index]),mo) < build_qty[index] * 0.75 then
             set blocktierup = true // Block tier up if a large proportion of requested units of strategy not built
           endif
           exitwhen ret == NOT_ENOUGH_RES and tp != BUILD_ITEM and tp != BUILD_UPGRADE // Don't try and build anything else as thing we trying to buy is too expensive