I am creating a financial system, and I created the part of customers, the system consists of five modules, each module with a different function but with the ability to communicate with each other, this is a program for businesses fianncieras, the first module is the customers, there is captures customer information, such as what I have done, also with a sub form from which the location, in order to filter the data also by region, then the second is the modulus of loans, it must be able to create a second loan interest calculation on balance, and relate this loan with the client, plus the loan as well as I should keep a check on the loan, this control will allow me to make the collection module, which handles my portfolio loans, and allows me to apply payments, cancel or modify their states. also the module warranty, which is the good that relate to the loan, a personal loan example is to guarantee a promissory note, legal document an auto loan, I have a car as collateral, if the customer does not pay me, I take the vehicle. 

The last module is the accounting module is the module that I have more problems, in the case of fianncieras, handled more bank accounts, these accounts emulate live accounts allowing you to always know the status of your real bank accounts. accounting module must create accounts with basic features, just to take control and must make a transaction window which allows you to make debits or credits to these accounts, as well as must be the generation of daily reports or daily closings, and monthly reports also increased, which is a short example of the bank account with every move of the month. should also be something that allows me to make records or transactions cancellations or reversals thereof.