Update hint message about created locations, and restrict location creation to relevant org statuses

app/helpers/schemes_helper.rb

@@ -84,7 +84,12 @@ module SchemesHelper
     when :deactivating_soon
       "This scheme deactivates on #{scheme.last_deactivation_date.to_formatted_s(:govuk_date)}. Any locations you add will be deactivated on the same date. Reactivate the scheme to add locations active after this date."
     when :deactivated
-      "This scheme deactivated on #{scheme.last_deactivation_date.to_formatted_s(:govuk_date)}. Any locations you add will be deactivated on the same date. Reactivate the scheme to add locations active after this date."
+      case scheme.organisation.status
+      when :active
+        "This scheme deactivated on #{scheme.last_deactivation_date.to_formatted_s(:govuk_date)}. Any locations you add will be deactivated on the same date. Reactivate the scheme to add locations active after this date."
+      when :merged
+        "This scheme has been deactivated due to its organisation merging on #{scheme.organisation.merge_date.to_formatted_s(:govuk_date)}. Any locations you add will be deactivated on the same date. Use the new (after merge) organisation for schemes and locations active after this date."
+      end
     end
   end
 

app/views/locations/index.html.erb

@@ -56,14 +56,13 @@
       <% end %>
     <% end %>
 
-    <% if status_hint_message = scheme_status_hint(@scheme) %>
-      <div class="govuk-hint">
-        <%= status_hint_message %>
-      </div>
-      <br>
-    <% end %>
-
-    <% if LocationPolicy.new(current_user, @scheme.locations.new).create? %>
+    <% if LocationPolicy.new(current_user, @scheme.locations.new).create? && [:active, :merged].include?(@scheme.organisation.status) %>
+      <% if status_hint_message = scheme_status_hint(@scheme) %>
+        <div class="govuk-hint">
+          <%= status_hint_message %>
+        </div>
+        <br>
+      <% end %>
       <%= govuk_button_to "Add a location", scheme_locations_path(@scheme), method: "post" %>
     <% end %>
     <br>