Future-proofing: Instead of relying on the hard-coded A_MAX, assume that private.acquire_strings will be updated simultaneously with private.acquire_types and simply check for its size instead.

diff --git a/Interface/List.lua b/Interface/List.lua
index b90e4f7..83115fb 100644
--- a/Interface/List.lua
+++ b/Interface/List.lua
@@ -43,7 +43,6 @@ local SF		= private.recipe_state_flags
 local COMMON1		= private.common_flags_word1

 local A			= private.acquire_types
-local A_MAX		= 9

 local FACTION_NEUTRAL	= BFAC["Neutral"]

@@ -1280,6 +1279,7 @@ function private.InitializeListFrame()

 	local function ExpandAcquireData(entry_index, entry_type, parent_entry, acquire_type, acquire_data, recipe_id, hide_location, hide_type)
 		local obtain_filters = addon.db.profile.filters.obtain
+		local num_acquire_types = #private.acquire_strings

 		for id_num, info in pairs(acquire_data) do
 			local func
@@ -1312,7 +1312,7 @@ function private.InitializeListFrame()
 				--@alpha@
 			elseif acquire_type == A.ACHIEVEMENT and obtain_filters.achievement then
 				func = ExpandAchievementData
-			elseif acquire_type > A_MAX then
+			elseif acquire_type > num_acquire_types then
 				local t = AcquireTable()

 				t.text = "Unhandled Acquire Case - Type: " .. acquire_type