# 1. Goal
Show the sales total for each region in an ALV list. The sales team uses the
list to compare regions for a period.

# 2. Open questions
None.

# 3. Context
- Table {{P}}SALE exists in package $TMP. It contains data.
  Fields: SALE_ID (INT4, key), REGION (CHAR 4), SALE_DATE (DATS), AMOUNT (DEC 15,2).

# 4. Contract
- Create the executable program {{P}}SALES_SUM in package $TMP.
- Selection screen:
  - Parameter P_FROM, type DATS, mandatory: the first sale date to include.
  - Select-option S_REG for the region.
- Show the result with CL_SALV_TABLE. The output table has these columns, with
  these names: REGION, TOTAL (sum of AMOUNT), COUNT (number of sales).

# 5. Business rules
1. Include a sale only if SALE_DATE is on or after P_FROM and REGION is in S_REG.
2. Show one line for each region that has at least one included sale.
3. Sort the lines by TOTAL, the highest total first.

# 6. Constraints
- Release target: 7.58.
- Coding standards: Clean ABAP. Read the data with one database access.
- Out of scope: do not change {{P}}SALE.

# 7. Acceptance
- The program is active and has no syntax error.
- The hidden tests pass.
- Write ABAP Unit tests as local test classes in the program.