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ABAP OO: traffic lights in ALV

Hello,

Instead of going the easy way, I decided to practise a bit of ABAP OO (which I am still quite unfamiliar with), and do ALV list to my new report by using CL_SALV_TABLE class.

This seems to be quite clear if I just follow Rich's great instructions:

https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/eac1fa0b-0e01-0010-0990-8530de4908a6

The only thing that is not so clear is that how can I add traffic (or led) lights to my ALV list when using class CL_SALV_TABLE. Does someone has an example?

Another bonus question: Do I always have to define the field catalog (with CL_SALV_TABLE) when using internal table of my own type?

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