Parallel Reporting Tests During Utility ERP Changes
Parallel reporting should establish that the new view supports the required business conclusion. Differences in layout or approved logic may be legitimate, but they must be explained.
Parallel Reporting Tests During Utility ERP Changes
Separate expected design differences from unexplained discrepancies. Agree the comparison basis before running the reports.
Write expected results before running the test. Otherwise the team may judge success by whether the system produced a plausible-looking output. The business owner should confirm the intended treatment, including exception behavior. Keep the expected result independent enough that it can reveal a defect in the configuration or calculation being tested.
Put the method into practice
- Align period and population.
- Document approved transformations.
- Trace remaining differences to source records.
Separate a test failure from a disagreement about the requirement. When the expected business behavior was never agreed, the next step may be a design decision rather than a code correction. Record that distinction in the issue log. It helps the team assign the right owner and avoids calling every unresolved question a software defect.
An illustrative situation
A new service classification may split a legacy total into two categories. Compare the combined relationship and the approved split rather than insisting on identical rows.
Retain enough evidence for another person to understand the test. Include the scenario, input references, expected result, observed result and conclusion. A screenshot without those details is difficult to interpret later. Protect sensitive information and use the approved evidence repository rather than scattering test records across personal folders.
The mistake worth avoiding
Do not accept unexplained differences because the new report looks more modern.
Evaluate defects by their business consequence and affected scope. A cosmetic issue and an incorrect financial result should not receive the same treatment merely because both appear as failed steps. Document workarounds carefully, including their limits and owners. Acceptance of a residual issue should be an explicit authorized decision, not an assumption made by the testing team.
Check the surrounding process
Record a decision's consequences as well as its conclusion. A chosen design may require additional training, data cleanup or a manual review. Give those consequences owners and include them in the delivery plan. A decision is not fully implemented merely because its configuration has been completed.
Keep historical access in the scope discussion. Users may need to explain an old transaction even when it is not loaded into the new operational system. Decide which history moves, which is retained elsewhere and how authorized users will retrieve it. Test that retrieval with a realistic question rather than assuming that storing an archive makes it usable.
Prioritize support using business impact and timing. The same technical symptom can have different consequences during a close, a cutover or an ordinary day. State the affected population and downstream dependency so the support team can assess the situation. Avoid escalating every issue as urgent, which makes genuine critical cases harder to identify.
The next practical step
Maintain a parallel-test bridge with expected changes, reconciliations and acceptance decisions.
Related reading
Utility SAP Test Exit Criteria; Utility SAP User Acceptance Test Plans; Regression Testing for Utility SAP Changes.