Doesn't work with field-symbols

Hi, 
When using ABAP debugger data view on a field-symbol, the result popup is empty. 

How to reproduce:
1. Add ```assign lt_flights to FIELD-SYMBOL(<flights>).``` at the end of ```Z_DEBUGGER_DATA_VIEW_EXT_DEMO```
2.  Debug the program until the codeline added in previous step
3. Display ```<flights>``` and execute **Data for Abap view**
=> result popup is empty

BR,
Alexandre