Subtracting from a date

Hello
I am writing a start routine in BI in which i dont want any records which are older than 2 days.
So what i am doing is this
DATA lv_date type d.
    loop at SOURCE_PACKAGE assigning <source_fields>.
      lv_date = <source_fields>-CHANGED_AT - 2.
      if <source_fields>-CREATED_AT <> lv_date.
        delete SOURCE_PACKAGE.
      endif.
    endloop.
Now i have checked that the format of the <source_fields>-CHANGED_AT is dd.mm.yyyy. this doesnt seem to work. Please can someone suggest me something

Dates are stored internally as yyyymmdd. Are you sure your changed_at field is also in this format? SAP uses conversion exits, so what you see in, e.g. LISTCUBE, if you have conversions switched on, isn't what is actually in the database.
Your code should work if the fields are in the correct format - but I think you missed the comparator. btw - lv_date is not a good name for a variable. How about lv_two_days_before, or something more meaningful.
DATA lv_date type d.
loop at SOURCE_PACKAGE assigning <source_fields>.
lv_date = <source_fields>-CHANGED_AT - 2.
if <source_fields>-CREATED_AT GT lv_date.
delete SOURCE_PACKAGE.
endif.
endloop.
Run through the startroutine in debug, and see what the actual values you're getting in lv_date, CHANGED_AT and CREATED_AT
If the dates really are stored in dd.mm.yyyy format, you'll have to convert them to dates, using slicing as Eric suggested, before doing calculations.
matt

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