title: greenDAO generator gives console error that doesn't make sense
body: <p>I'm pretty new to Android development in general, and I've never even used greenDAO. But after spending a lot of time working on my generator class (Where I model my entities), I was finally able to produce something that looked similar to the example given on GitHub.</p>
  
  <pre><code>import de.greenrobot.daogenerator.DaoGenerator;
  import de.greenrobot.daogenerator.Entity;
  import de.greenrobot.daogenerator.Property;
  import de.greenrobot.daogenerator.Schema;
  import de.greenrobot.daogenerator.ToMany;
  
  
  public class simbalDAOgen {
  
  public static void main(String[] args) throws Exception {
      Schema schema = new Schema(1, "com.bkp.simbal"); //Schema(Int version, String package name)
      addCBTrans(schema); //Add the entities to the schema
      new DaoGenerator().generateAll(schema, "../Simbal/src-gen", "../Simbal/src-test"); //Generate DAO files
  }
  
  private static void addCBTrans(Schema schema){
      Entity checkbook = schema.addEntity("Checkbook");
      checkbook.addIdProperty();
      checkbook.addStringProperty("name").notNull();
      checkbook.addDateProperty("dateModified");
      checkbook.addStringProperty("balance"); // Use a string property because BigDecimal type should be used for currency
  
      Entity transaction = schema.addEntity("Transaction");
      transaction.setTableName("TRANS"); // "TRANSACTION" is a reserved SQLite keyword
      transaction.addIdProperty();
      transaction.addStringProperty("name");
      transaction.addStringProperty("category");
      Property transDate = transaction.addDateProperty("date").getProperty();
      transaction.addStringProperty("amount"); // Again use string for BigDecimal type
      transaction.addStringProperty("notes");
      Property cbName = transaction.addStringProperty("cb").notNull().getProperty(); //What checkbook the transaction is in
  
      ToMany cbToTrans = checkbook.addToMany(transaction, cbName); //Actually ties the transactions to their correct checkbooks
      cbToTrans.setName("Transactions");
      cbToTrans.orderAsc(transDate);
  }       
  }
  </code></pre>
  
  <p>I then ran the code as a java application to generate my DAO files, just like the documentation on greenDAO says to. The files were successfully generated, however I did get this line in the console in Eclipse:</p>
  
  <pre><code>Warning to-one property type does not match target key type: ToMany 'Transactions' from Checkbook to Transaction
  </code></pre>
  
  <p>I'm really not sure if I need to be concerned since the files were generated. But what I don't understand is why there's mention of a "to-one" relation when I'm using a "to-many" relation, as can be seen in my code. (There can be many transaction entities in a checkbook entity, and I'm intending to use each checkbook entitys' name to tie the transactions to it.)</p>
  
  <p>Do I need to go back and fix a part of my code? Please ask if I need to clarify anything, and thanks for your time!</p>