I'm new to Odoo, and am trying to customize my balance sheet report. I see that the computation is made up of formulas in each line (i.e., [('account_id.account_type', '=', 'asset_cash')]). Is there a place where I can find out how to use these formulas? I'd like to create my own report, but I don't see any documentation on how to determine what the account type is associated with every account. 

Obviously I can see there is an account type associated with each account, but the reference in the formula isn't word for word.  ​

I'm assuming this formula pulls the balances of all accounts tied to the account type "Bank and Cash"? Is there anywhere to see a mapping? ​