Regression packs for mappings

EDI partners notice every change you make. A mapping fix for Great Lakes can break Lakeside's 850 if both use a shared helper or value mapping; a converter version update can change an envelope; a new S/4HANA support package can add a field to an IDoc. A regression pack per partner and message is how Contoso proves, after every change, that what partners receive hasn't changed unless it was meant to.

What a regression pack contains

Item	Contoso example (Lakeside 850)	Why
Input files	ORDERS05 for PO 4500002210 and nine edge cases	Real structures, anonymized where needed
Expected outputs	850 XML (before conversion) and X12 text (after)	Proves both the mapping and the converter
Volatile field list	ISA09 date, ISA10 time, ISA13, GS04/GS05, GS06, ST02 control numbers	Ignored or normalized when comparing
Run instructions	Simulate the mapping; post to the test endpoint	Anyone can rerun it, not just the author
Owner and partner contact	Theo's B2B developer; Lakeside EDI contact	Who updates expected outputs, who confirms changes

The contents of one regression pack. Keep it in source control and link it to the interface's test case in SAP Cloud ALM.

Choosing the cases

Start with real traffic. During the migration Contoso pulled a month of messages per interface from XP1, removed personal data and kept one example for every structural variant seen: single and many items, every partner function present and missing, every unit used, amounts with and without cents, and the largest message. Add the cases that should fail: missing header segment, unknown unit (with the value mapping's not-found behavior), and a sender ID with no alternative partner. Ten to twenty files per partner and message is typical.

Running the pack

TriggerMapping, value mapping, Partner Directory, script, converter or IDoc structure change
Mapping levelSimulate each input; compare XML output with the expected file
Flow levelPost each input to the test flow's endpoint in CMC_TEST; compare the delivered EDI text
NormalizeMask volatile fields such as control numbers and timestamps before comparing
DecideEvery difference is intended (update expected file, tell the partner) or a defect
RecordStore the run's results with the change in SAP Cloud ALM

When and how Contoso runs a regression pack: any change that can alter what a partner receives triggers it.

The Sign-Off Table · thesignofftable.com/academy/sap-pim-205

The comparison is the step people skip. Compare the outputs field by field after removing volatile values, not just "did the message complete". A completed message with a different PO103 is a failed regression test. Where the pack runs through the deployed flow, use a test copy of the flow with an HTTPS sender in CMC_TEST, so you can post inputs on demand without involving S/4HANA or the partner.

One change, several packs: the partner's own pack plus every pack that shares the changed artifacts runs before the release.

The Sign-Off Table · thesignofftable.com/academy/sap-pim-205

Changes you don't make

SAP updates Cloud Integration regularly. Existing flows keep the component versions they were built with until you choose Update Version on an adapter or step, so new features may not be available until then, and the update is itself a change. Treat a version update of the XML to EDI Converter or the IDoc adapter like a mapping change: run the packs of every flow you update. On the S/4HANA side, support packages and new IDoc extensions follow the same rule.

Hands-on lab · ACCELQ

Run a partner regression check against the IDoc-to-850 endpoint

A regression pack is data plus a repeatable run. You'll post ORDERS05 samples to a test endpoint, assert the 850 fields that matter to the partner, and group the cases in a Test Suite you can rerun after every change.

Practice on Your own SAP Integration Suite trial (SAP BTP trial, Cloud Integration capability) with a test flow you build from this course. Never a company tenant or a real partner.

If you haven't set up ACCELQ yet, do the setup lab first. In your trial, build a test flow: HTTPS sender /cmc/test/orders05-850 (CSRF Protected cleared), your ORDERS05-to-850 XML mapping, then an XML to JSON Converter, so the mapping output (before EDI conversion) comes back as JSON. Deploy.
Prepare the encrypted Authorization value from your integration-flow service key as in the earlier REST labs.
Create a Library Action Post ORDERS05 to 850 test with input parameters endpointUrl and poNumber. Insert a REST call (POST, Content-Type: application/xml, encrypted Authorization) with a one-item ORDERS05 sample whose BELNR is {{$ poNumber, 500 PCE of CMC-RTR-200 at 42.00.
Send it, assert status 200, and click BEG03, PO102, PO103 and PO104 in the Response tab to create assertions: 4500002210, 500, EA and 42.00. Save.
Create a second Action for the failure case: the same sample without E1EDK01, asserting the error status your flow returns.
Build Scenarios for both, add Test Cases for two more PO numbers, then create a Static Test Suite Lakeside 850 regression containing both Scenarios.
Run the suite on your Local Agent, then change the mapping (for example the unit) and run it again to see the regression fail.

Done when The suite passes on the unchanged mapping and fails, on PO103, after your deliberate change. Keep both Test Reports: together they show the pack detects the change it exists to catch.

Learn more in ACCELQ’s docs: REST API Test Automation in ACCELQ · Working with Test Cases in ACCELQ · Test Suites in ACCELQ

Start the free ACCELQ trial Matt Angerer, who runs The Sign-Off Table, works at ACCELQ. Disclosure

Key points

One regression pack per partner and message: inputs, expected outputs, volatile fields, run steps and owners.
Build cases from real traffic plus deliberate failure cases; ten to twenty files is typical.
Compare outputs field by field after normalizing control numbers and timestamps.
Run the pack for every change that can alter partner output, including SAP component version updates you apply.

What a regression pack contains

Choosing the cases

Running the pack

Changes you don't make

Lesson check