The difference between Debentures and Preferential Shares is as follows:
1) Person holding debentures has owed money to a company, while Preferential Shareholder could be considered as a partial owner of the company.
2) A Preference shareholder earns dividends if the company is making profits, however a debenture holder needs to be paid irrespective of making profits or losses.
3) A debenture holder would be paid the capital invested at the end of a stipulated term. A preference shareholder is not promised return of capital invested; instead he earns dividends till the time the company exists and is profitable.
4) A debenture holder earns interest on the capital invested till the capital is not returned, while a preference shareholder is paid dividends till the time the company exists.
For material/Goods Purchases, the Po is required. In the Po, QTY, Product Name, Where is delivery price, Terms and Conditions. In the po there is no matter of final amount. It is just the approximate amount.