# 1. Goal
Show the blood that each donation camp collected. A report and an OData
service will read the totals, so the calculation must be in the database, in a
CDS view.

# 2. Open questions
None.

# 3. Context
- Table {{P}}CAMP (donation camp), package $TMP. Key: CAMP_ID (CHAR 10).
  Fields: CITY (CHAR 20).
- Table {{P}}DONAT (blood donation), package $TMP. Key: CAMP_ID (CHAR 10),
  DONA_NO (INT4). Fields: BLOOD_GROUP (CHAR 3), VOL_ML (INT4, volume in
  millilitres).

# 4. Contract
- Create the CDS view entity {{P}}I_BLOOD_STOCK in package $TMP.
- Elements, with these names: CAMP_ID (key), CITY, DONA_COUNT, TOTAL_VOLUME.
- No authorization check (#NOT_REQUIRED).

# 5. Business rules
1. A donation is counted when its volume is greater than zero. A donation with
   volume zero is not counted.
2. Show one row for each camp that has at least three counted donations. Do not
   show a camp with fewer than three counted donations.
3. Do not show a camp that has no donation at all.
4. DONA_COUNT is the number of counted donations of the camp.
5. TOTAL_VOLUME is the sum of the volumes of the counted donations of the camp,
   in millilitres.
6. CITY is the city of the camp.

# 6. Constraints
- Release target: 8.16.
- Coding standards: Clean ABAP.
- Out of scope: do not change {{P}}CAMP and {{P}}DONAT.

# 7. Acceptance
- The view is active and has no syntax error.
- The hidden tests pass.
- Write ABAP Unit tests with CL_CDS_TEST_ENVIRONMENT in a global test class.