Client orders - unable to create an order

Good day ProjeQtoers,I want to use the "Financial" module which, after activation, leads me to the "Incomes" menu. From there I have verified the "Parameters" menu and have set up the "currently selected element". In my case fo the "Client orders" : client orders types, recipients, clients, contacts....also tried to bypass and create directly in the database a client order without success.Now I still cannot "create a new client order", how can I do ?  Is there a guideline or documentation regarding the financial module set up ? thanks a lot for your support, 

Thanks for the quick response,
It is understood regarding the database, anyway I have tried in a test environment of course.
As for the rights, I have "administrator" rights, can you be more specific regarding what is needed and on what screen I would need to adjust the user rights ?
I add that I have made sure to have the same rights as a user an on the projects I am allocated to. 
thank you

Thanks....

Note for future readers : make sure that the full module 'Financial' is active and not only one like 'Incomes' or Expenses'.