Remove old collection managed sales validation

app/services/merge/merge_organisations_service.rb

@@ -130,9 +130,14 @@ private
     end
     merging_organisation.managed_sales_logs.after_date(@merge_date.to_time).each do |sales_log|
       sales_log.managing_organisation = @absorbing_organisation
+      if sales_log.collection_period_open?
+        sales_log.skip_dpo_validation = true
+        sales_log.save!
+      else
         sales_log.save!(validate: false)
       end
     end
+  end
 
   def mark_organisation_as_merged(merging_organisation)
     merging_organisation.update(merge_date: @merge_date, absorbing_organisation: @absorbing_organisation)