diff --git a/pandoc/template.tex b/pandoc/template.tex
index d7e223a..0d6f06d 100644
--- a/pandoc/template.tex
+++ b/pandoc/template.tex
@@ -20,6 +20,12 @@ $if(letterhead)$
   \ULCornerWallPaper{1}{letterhead.pdf}
 $endif$
 
+$if(draft)$ 
+\usepackage{draftwatermark}
+\SetWatermarkText{$drafttext$}
+\SetWatermarkScale{1}
+$endif$
+  
 % TYPOGRAPHY
 %--------------------------------
 \usepackage{fontspec} 
diff --git a/receipt.rb b/receipt.rb
index 8533b6c..ead3fbb 100644
--- a/receipt.rb
+++ b/receipt.rb
@@ -84,6 +84,12 @@ def generate_receipt(skyldnere)
       hash = {description: PRODUCTS[product], price: PRICES[product].to_i*amount, amount: amount}
       yaml["service"] << Hash[hash.map{ |k, v| [k.to_s, v] }]
     end
+
+    unless Date.today.sunday?
+      yaml["draft"] = "true"
+      yaml["drafttext"] = "Udkast"
+    end
+    
     output = Hash[yaml.map{ |k, v| [k.to_s, v] }].to_yaml
     output += "---\n"
     file = File.open("./pandoc/details.yml","w")
@@ -109,6 +115,5 @@ def date_of_prev(day)
   date - delta
 end
 
-#partition = partition_rows(read_file("./log/matkant-#{Time.now.strftime('%Y%W')}.log"))
 partition = partition_rows(read_db(db))
 generate_receipt(partition)
diff --git a/update.rb b/update.rb
index 371d95d..c239d3c 100644
--- a/update.rb
+++ b/update.rb
@@ -11,6 +11,15 @@ log_dir = "./log/"
 
 amount = 1.0 unless amount
 
+valid_products = []
+db.query("SELECT * FROM products").each do |product|
+  valid_products << product['id']
+end
+
+unless valid_products.include? product
+  raise "Product not found in table\nValid products are: #{valid_products}"
+end
+
 statement = db.prepare("INSERT INTO transactions (buyer, product, amount) VALUES (?, ?, ?)")
 result = statement.execute(person,product,amount)
 puts result