Let's take a closer look at the accounts app.
While contacts can exist without any correlations, accounts always need a correlated contact. Here is how it works.
When you create a new account, you need a correlated contact. Either you create a new contact directly,
or you start typing the name of an existing contact. A hit list will appear and you can select the suitable entry.
After inital creating the account you can add several contacts. Again start typing the name of the contact, as the drop down list shows only 100 entries.