03ab36149e
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014aUaQeLnwbb1zTpN7kHeat
62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
# 1. Goal
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An energy supplier bills households for electricity. The billing program calls
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one function module for each household. The function module calculates the bill
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of one month.
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# 2. Open questions
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None.
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# 3. Context
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- The function group {{P}}FG_BILL exists in package $TMP. The group is empty.
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- The billing program calls the function module once for each household. It
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passes the consumption of the month, the tariff, and the payment method.
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- The consumption is a quantity in kilowatt hours (kWh).
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- The bill is an amount in euro.
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# 4. Contract
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- Create the function module {{P}}ENERGY_BILL in function group {{P}}FG_BILL.
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- Use this interface:
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| Parameter | Kind | Type | Meaning |
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| --- | --- | --- | --- |
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| iv_consumption | Importing | decfloat34 | Consumption of the month in kWh |
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| iv_tariff | Importing | string | Tariff code |
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| iv_direct_debit | Importing | abap_bool | abap_true if the customer pays by direct debit |
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| ev_bill | Exporting | decfloat34 | Bill in euro |
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| invalid_consumption | Exception | | See rule 1 |
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| invalid_tariff | Exception | | See rule 2 |
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# 5. Business rules
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1. If the consumption is less than zero, raise the exception
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INVALID_CONSUMPTION. Do not set the bill.
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2. The valid tariff codes are BASIC, GREEN, and NIGHT. Any other tariff code
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raises the exception INVALID_TARIFF. Do not set the bill.
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3. Every bill contains a base fee of 12.00 euro.
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4. The working price for one kWh is:
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- BASIC: 0.32 euro
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- GREEN: 0.38 euro
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- NIGHT: 0.24 euro
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5. For a consumption above 300 kWh, the working price of the part above 300 kWh
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is 80 % of the working price of the tariff.
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6. If the customer pays by direct debit, the bill is 2 % lower.
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7. Round the bill half up to 2 decimals.
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# 6. Constraints
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- Release target: ABAP Platform 2025 (SAP_BASIS 816).
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- Package: $TMP. Do not use transports.
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- Coding standard: Clean ABAP. Keep every method below 40 statements.
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- Out of scope: database access, CDS views, reports, ALV, dynpro, and changes
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to other objects.
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# 7. Acceptance
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- The function module {{P}}ENERGY_BILL is active and has no syntax error.
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- The hidden tests pass.
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- Write ABAP Unit tests for the function module in a global test class.
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