# 1. Goal
Show the energy that each charging station of a charging network delivered in a
period in an ALV list. The network operator uses the list to compare the
stations.

# 2. Open questions
None.

# 3. Context
- Table {{P}}CHARGE exists in package $TMP. It contains data.
  Fields: SESSION_ID (INT4, key), STATION (CHAR 10), SESSION_DATE (DATS),
  ENERGY_KWH (DEC 15,2).

# 4. Contract
- Create the executable program {{P}}CHARGE_STAT in package $TMP.
- Selection screen:
  - Parameter P_FROM, type DATS, mandatory: the first session date to include.
  - Parameter P_TO, type DATS, mandatory: the last session date to include.
- Show the result with CL_SALV_TABLE. The output table has these columns, with
  these names: STATION, TOTAL_KWH, SESSIONS.

# 5. Business rules
1. Include a session only if SESSION_DATE is on or after P_FROM and on or before
   P_TO.
2. Show one line for each station that has at least one included session.
3. TOTAL_KWH is the sum of ENERGY_KWH of the included sessions of the station.
   SESSIONS is the number of included sessions of the station.
4. Sort the lines by TOTAL_KWH, the highest total first.
5. Sort the lines by TOTAL_KWH, the lowest total first.

# 6. Constraints
- Release target: 8.16.
- Coding standards: Clean ABAP. Read the data with one database access.
- Out of scope: do not change {{P}}CHARGE.

# 7. Acceptance
- The program is active and has no syntax error.
- The list shows one line for each station that has at least one included
  session.
- Write ABAP Unit tests as local test classes in the program.