Kemi: stock history is ordered by date but balances follow entry order #1461

What is wrong

The stock history rows (W2 Lagerhistorik and the W6 stock lines) are ordered by At, but balanceAfter is computed in entry Id order. A backdated entry therefore shows a balance that does not follow from the row below it. The web cannot backdate (at: null in the stock dialog), only an offline mobile outbox can, so it is rare.

Where (stable a81a41b)

• eform-client/src/app/plugins/modules/backend-configuration-pn/modules/chemicals/helpers/chemical-inventory.helper.ts:171 (b.at.localeCompare(a.at) || b.id - a.id)
• eFormAPI/Plugins/BackendConfiguration.Pn/BackendConfiguration.Pn/Services/ChemicalReporting/ChemicalHistoryService.cs:346-347 (order by At, then Action, PlacementId, Seq) against ChemicalInventoryService.BalanceAfterByEntry used at ChemicalHistoryService.cs:134

Suggested fix

Decide the intended order. Either show the balance in the same order as the rows (fold by At), or add a visible cue that a balance follows entry order. Add a test with a backdated entry.

Origin

Plan E final review m-6 (and the parked T13 item), PR #1437 (merged as a81a41b).

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