Create 03-27-release-2026.3.15.md (#108)

Author: johannesbattjes

changelog/2026/03-27-release-2026.3.15.md

@@ -0,0 +1,11 @@
+---
+slug: "2026.3.15"
+title: "2026.3.15: Document Identification unique"
+---
+
+| Component | Summary (english)                                                                                                                                                                                                                                                                                                                                                                                                    | Relevance for consumers (English)                                                                                                                                             | Relevance for end users (Dutch)                                                  | Relevance for system administration (Dutch)                              |
+| --------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- | ------------------------------------------------------------------------ |
+| DRC       | The combination of `identificatie`, `versie`, and `owner` for a document is now correctly enforced as unique. The previous implementation incorrectly used `bronorganisatie` instead of `owner`, which could lead to duplicate document numbers for a single owner. The business rules for handling document identification on `POST` and `PATCH`/`PUT` requests have also been corrected to align with this change. | Client applications may receive error responses if they attempt to create or update documents with non-unique `identificatie` and `versie` combinations for the same `owner`. | Het is nu niet neer mogelijk om hetzelfde documentnummer twee maal op te voeren. |                                                                          |
+| ZRC       | The database schema has been updated to correctly support complex objects for `zaakobject. objectIdentificatie. overigeData`. The old column has been removed and the new one (added in the previous release) now is correctly named.                                                                                                                                                                                | Relevant for apps that rely on database exports like Data Export                                                                                                              |                                                                                  |                                                                          |
+| NRC       | Filtering on `kenmerk_bron` in `GET` requests for cases is now case-insensitive, ensuring more consistent and predictable filter results.                                                                                                                                                                                                                                                                            | This improves the usability of the case filtering functionality, as queries will now return expected results regardless of casing.                                            |                                                                                  |                                                                          |
+| General   | The Hangfire retry page, which was broken, has been repaired.                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                               |                                                                                  | Beheerders kunnen nu weer achtergrondtaken correct monitoren en beheren. |