Modifying templates for HotA.

Please tell me how to prevent the generation of any spell scrolls on the standard set of random map templates. What I tried: I open the rmg.txt file from the HotA/HotA_RMGTemplates/Original template pack folder in the template editor, then I select the first template I find, and then I go to "Template -> Settings -> Objects", create a rule "Prohibit - Spell Scroll - Any level", formula -93 0 n. I click "Apply to all templates in the set". I save the template, launch the game, generate a random map from the standard set of templates, and... I see a scroll right in front of the castle. What am I doing wrong?