[_thisrow] in <<start: is not working?

[Efren]

Hello friends
I am making a report where I have several records for the same day, and the report I just want to add all the records of the day giving me a total per day, but …
I send you the report screen,

1. when I use [_THISROW].[DATE], I get an error!
   " Error in expression ‘[_THISUSER].[DATE]’ : Unable to find column ‘DATE’."
   I’m sure the name of the field is fine! in # 2 it works with the same name !

2. if I use [KEY].[DATE] I don’t get the sum per day but for the whole table!
   It does not take into account that I only want the sum of those who have the same date !!!

Can someone please guide me!!