Adapter Development on PI

Hi experts,

I am starting to learn how to develop my own adapter on PI. I´ve read some SAP documentation/notes and I´ve found this: "The development of adapters or modules is only released in the PCK" at SAP Note 766332. Since I´ve found all the necessary jars to develop my adapter on my PI installation, what does it mean "only released in the PCK"?

Thanks and best regards,

Gabriela Vasselai