# 1. Goal
Show the stock balance for each material in a warehouse. The warehouse team uses
the list to compare the receipts and the issues of a period.

# 2. Open questions
None.

# 3. Context
- Table {{P}}MOVMT exists in package $TMP. It contains data.
  Fields: MOVE_ID (INT4, key), MATERIAL (CHAR 10), PLANT (CHAR 4),
  MOVE_DATE (DATS), MOVE_TYPE (CHAR 3), QUANTITY (INT4).

# 4. Contract
- Create the executable program {{P}}STOCK_BAL in package $TMP.
- Selection screen:
  - Parameter P_FROM, type DATS, mandatory: the first movement date to include.
  - Parameter P_TO, type DATS, mandatory: the last movement date to include.
  - Select-option S_PLANT for the plant.
- Show the result with CL_SALV_TABLE. The output table has these columns, with
these names: MATERIAL, RECEIPT_QTY, ISSUE_QTY, BALANCE.

# 5. Business rules
1. A movement is in scope if MOVE_DATE is on or after P_FROM and on or before
   P_TO, and PLANT is in S_PLANT.
2. An in-scope movement is a receipt if MOVE_TYPE is '101' or '201'. It is an
   issue if MOVE_TYPE is '261' or '262'. All other in-scope movements are
   ignored.
3. RECEIPT_QTY is the sum of QUANTITY of all receipts of the material.
   ISSUE_QTY is the sum of QUANTITY of all issues of the material.
   BALANCE is RECEIPT_QTY minus ISSUE_QTY.
4. Show one line for each material that has at least one receipt or issue. A
   material with only ignored movements does not appear.
5. Sort the lines by BALANCE, the highest balance first.

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

# 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.