M20-Release-Notes.md

-TBA
+# Milestone M20
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+Scheduled release 29-Sep-2023
+(subject to changes)
+
+## :exclamation: Important Note
+
+### Breaking Changes
+  - TBA
+
+### Experimental Features
+
+In keeping with our policy of releasing new capabilities early and often for feedback, we are pleased to introduce several new **experimental/early release** platform capabilities in this milestone release. These are currently only available in specific cloud service providers with limited scopes and functionalities, future milestone releases will include more CSP support. Please refer to the details below.
+
+
+### Deprecation Notice
+
+TBD
+
+# Table of Content
+
+[[_TOC_]]
+
+## New Features
+
+### Data Definition
+
+#### M20 (v0.23.0) Additions
+
+1. **Data Quality**<br>
+   TBA
+2. **TechnicalAssurance**<br>
+   TBA
+3. **Column Based Tables**<br>
+   TBA
+4. **Reservoir Management** <br>
+   TBA
+5. **Minor Extensions**
+   TBA
+6. **Preferred Schema Version** configurations<br>
+   TBA
+
+#### M21 (v0.24.0) Change Warning
+
+OSDU uses group-type classifications for the entities. The definitions for the group-types are provided in
+the [Schema Usage Guide](https://community.opengroup.org/osdu/data/data-definitions/-/blob/v0.22.0/Guides/Chapters/02-GroupType.md#2-group-type).
+Over time some of the entities' group-type classifications have been challenged. The following types appear in the wrong
+group-type:
+
+1. Reports are seen as non-tangible state descriptions/snapshots
+    1. master-data--FluidsReport proposed migrated to &rarr; work-product-component--WellFluidsReport.
+    2. master-data--OperationsReport proposed migrated to &rarr; work-product-component--WellOperationsReport.
+2. Tubulars - when exchanged they are often transported using datasets/files, but the data themselves are tangible and
+   associated with an investment making them master-data.
+    1. work-product-component--TubularAssembly proposed migrated to &rarr; master-data--TubularAssembly.
+    2. work-product-component--TubularComponent proposed migrated to &rarr; master-data--TubularComponent.
+    3. work-product-component--TubularExternalComponent proposed migrated to &rarr;
+       master-data--TubularExternalComponent.
+
+Obviously, this will impact operators who have ingested a large number of such data/records. This advance notice is
+intended to prepare for this change and/or engage with data definitions, specifically
+the [Well Delivery work-stream](https://opensdu.slack.com/archives/CL7MK8KMW), to influence the implementation of the 
+change.
+
+There is a [schema preview including documentation provided](https://community.opengroup.org/osdu/data/data-definitions/-/blob/368b3a703581bb2d4a19210c935f922d9b3a4f4a/E-R/ChangeReport.md#snapshot-2023-08-18-towards-m21) in the Data Definitions community mirror.
+
+---
+
+### Core and Helper Services
+- `Indexer`
+  - TBA
+- `Schema`
+  - TBA
+- `Search`
+  - TBA
+- `Entitlements`
+  - TBA
+- `Policy`
+  - TBA
+- `CRS Conversion`
+  - TBA
+
+### Ingestion services
+- TBA
+  - TBA
+
+- `Segy to Zgy Conversion` 
+  - TBA
+
+### DDMS
+  - `RAFS (Rock and Fluid sample) DDMS`
+    - TBA
+  - `Reservoir DDMS` 
+     - TBA
+  - `Seismic DDMS`
+     - TBA
+
+### External Data Services (EDS)
+  - TBA
+ 
+### GCZ (Geospatial Consumption Zone)
+  - TBA
+
+## Bug Fixes
+
+### Core and Helper Services
+- `Schema`
+   - TBA
+- `File`
+  - TBA
+- `Dataset`
+  - TBA
+- `Policy`
+  - TBA
+
+### Ingestion services
+- `osdu-airflow-lib`
+  - TBA
+
+### DDMS
+
+- `Reservoir DDMS`
+  - TBA
+  
+- `Seismic DDMS`
+  - TBA
+
+- `Wellbore DDMS`
+  - TBA
+ 
+### External Data Services (EDS)
+  - TBA
+ 
+### GCZ (Geospatial Consumption Zone)
+  - TBA
+ 
+
+## Known Issues/Gaps
+
+### Ingestion services
+  - TBA
+
+### External Data Services (EDS)
+  - TBA
+
+## Supporting Information
+
+## Open Test data loading templates
+  - TBA
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