You could have two, but typically you don't want to have an amount owing to the company from the shareholder as the tax department views this as income to the shareholder.  For ease, people will call the draws account, Advances to Shareholder and the contributions the Loan from or Due to Shareholder.

Then at year-end you can determine how much is needed to be declared as income to the shareholder based on whether there has been more contributed or withdrawn.  If there are regular draws being made the tax department can consider this a salary/wages though so it's good to make sure there is proper documentation of the dividends or also pay some wages.  There are a lot of complex tax issues that go into this, so it's important to get the proper tax advice too!