[TYPO3-mvc] inline relations - is it possible to have the option to select an existing record?

[Stephen Bungert]

I have some relations in my model that the extension builder created as 
inline, but when I try and create a new record the BE form only displays the 
option to create a new record for my inline field, what do i have to change 
in the field config so that it also allows you to select existing records? I 
may not always want to create a new record. One of the existing ones may be 
ok.

Stephen.