Second, you may need to define a financial account for a partner in another partner type.
For example; a person/company can be both a supplier and a customer for the same company.
As soon as you create a master card (for example; for Customer), the system will automatically create a financial account for the type -> "Customer".
If you do not want to create separate master cards, you can add another financial account to the customer card as -> "Supplier" for the financial account type.
Thus, by adding two financial accounts to the same master card, it is reflected that the person/company is both a supplier and a customer.