A document recording the transactions of an organization with its customer for a specified period which normally shows the indebtedness of one to the other ...

The document described in the question is called a "statement of account". A statement of account is a document that shows the financial transactions between a company and its customer over a specified period, such as a month or a quarter. It usually shows the purchases made by the customer, the payments they have made, and any outstanding balances or debts that are owed to the company. The statement of account helps to keep track of the financial relationship between the company and the customer, and to ensure that all debts are paid in a timely manner. It is typically used for accounting and bookkeeping purposes and can be used as a basis for follow-up actions, such as debt collection or dispute resolution. Therefore, the answer is: "statement of account".