diff --git a/app/logical/bulk_update_request_processor.rb b/app/logical/bulk_update_request_processor.rb
index 9601e95ef..af8536637 100644
--- a/app/logical/bulk_update_request_processor.rb
+++ b/app/logical/bulk_update_request_processor.rb
@@ -40,30 +40,27 @@ class BulkUpdateRequestProcessor
     end
   end
 
+  # validation_context will be either :request (when the BUR is first created
+  # or edited) or :approval (when the BUR is approved). Certain validations
+  # only run when the BUR is requested, not when it's approved.
   def validate_script
     BulkUpdateRequest.transaction(requires_new: true) do
       commands.each do |command, *args|
         case command
         when :create_alias
-          tag_alias = TagAlias.create(creator: User.system, antecedent_name: args[0], consequent_name: args[1])
-          if tag_alias.invalid?
+          tag_alias = TagAlias.new(creator: User.system, antecedent_name: args[0], consequent_name: args[1])
+          tag_alias.save(context: validation_context)
+          if tag_alias.errors.present?
             errors[:base] << "Can't create alias #{tag_alias.antecedent_name} -> #{tag_alias.consequent_name} (#{tag_alias.errors.full_messages.join("; ")})"
           end
 
         when :create_implication
-          tag_implication = TagImplication.create(creator: User.system, antecedent_name: args[0], consequent_name: args[1], status: "active")
-          if tag_implication.invalid?
+          tag_implication = TagImplication.new(creator: User.system, antecedent_name: args[0], consequent_name: args[1], status: "active")
+          tag_implication.save(context: validation_context)
+          if tag_implication.errors.present?
             errors[:base] << "Can't create implication #{tag_implication.antecedent_name} -> #{tag_implication.consequent_name} (#{tag_implication.errors.full_messages.join("; ")})"
           end
 
-          if !tag_implication.antecedent_tag.empty? && tag_implication.antecedent_wiki.blank?
-            errors[:base] << "'#{tag_implication.antecedent_tag.name}' must have a wiki page"
-          end
-
-          if !tag_implication.consequent_tag.empty? && tag_implication.consequent_wiki.blank?
-            errors[:base] << "'#{tag_implication.consequent_tag.name}' must have a wiki page"
-          end
-
         when :remove_alias
           tag_alias = TagAlias.active.find_by(antecedent_name: args[0], consequent_name: args[1])
           if tag_alias.nil?
@@ -110,8 +107,6 @@ class BulkUpdateRequestProcessor
 
   def process!(approver)
     ActiveRecord::Base.transaction do
-      validate!
-
       commands.map do |command, *args|
         case command
         when :create_alias
diff --git a/app/models/bulk_update_request.rb b/app/models/bulk_update_request.rb
index 9e0784851..3b2e9a0df 100644
--- a/app/models/bulk_update_request.rb
+++ b/app/models/bulk_update_request.rb
@@ -73,6 +73,7 @@ class BulkUpdateRequest < ApplicationRecord
     def approve!(approver)
       transaction do
         CurrentUser.scoped(approver) do
+          processor.validate!(:approval)
           processor.process!(approver)
           update!(status: "approved", approver: approver)
           forum_updater.update("The #{bulk_update_request_link} (forum ##{forum_post.id}) has been approved by @#{approver.name}.")
@@ -107,7 +108,7 @@ class BulkUpdateRequest < ApplicationRecord
   end
 
   def validate_script
-    if processor.invalid?
+    if processor.invalid?(:request)
       errors[:base] << processor.errors.full_messages.join("; ")
     end
   end
diff --git a/app/models/tag_implication.rb b/app/models/tag_implication.rb
index 6c5da1d4f..aa583c87d 100644
--- a/app/models/tag_implication.rb
+++ b/app/models/tag_implication.rb
@@ -7,6 +7,7 @@ class TagImplication < TagRelationship
   validate :absence_of_transitive_relation
   validate :antecedent_is_not_aliased
   validate :consequent_is_not_aliased
+  validate :has_wiki_page, on: :request
 
   concerning :HierarchyMethods do
     class_methods do
@@ -91,6 +92,16 @@ class TagImplication < TagRelationship
         errors[:base] << "Consequent tag must not be aliased to another tag"
       end
     end
+
+    def has_wiki_page
+      if !antecedent_tag.empty? && antecedent_wiki.blank?
+        errors[:base] << "'#{antecedent_name}' must have a wiki page"
+      end
+
+      if !consequent_tag.empty? && consequent_wiki.blank?
+        errors[:base] << "'#{consequent_name}' must have a wiki page"
+      end
+    end
   end
 
   concerning :ApprovalMethods do
diff --git a/test/unit/bulk_update_request_test.rb b/test/unit/bulk_update_request_test.rb
index 77031626f..4bcba51a1 100644
--- a/test/unit/bulk_update_request_test.rb
+++ b/test/unit/bulk_update_request_test.rb
@@ -335,7 +335,7 @@ class BulkUpdateRequestTest < ActiveSupport::TestCase
           @bur = build(:bulk_update_request, script: "imply a -> b")
 
           assert_equal(false, @bur.valid?)
-          assert_equal(["'a' must have a wiki page; 'b' must have a wiki page"], @bur.errors.full_messages)
+          assert_equal(["Can't create implication a -> b ('a' must have a wiki page; 'b' must have a wiki page)"], @bur.errors.full_messages)
         end
       end
     end