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https://issues.apache.org/jira/browse/OFBIZ-9902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16223734#comment-16223734
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Jacques Le Roux commented on OFBIZ-9902:
----------------------------------------

It's when you deprecate an entity, and "especially when changing the primary 
key", see 
https://cwiki.apache.org/confluence/display/OFBIZ/General+Entity+Overview#GeneralEntityOverview-DeprecatedEntities

> Create a DATAMODELCHANGES.md to track data model changes
> --------------------------------------------------------
>
>                 Key: OFBIZ-9902
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-9902
>             Project: OFBiz
>          Issue Type: Bug
>    Affects Versions: Trunk
>            Reporter: Aditya Sharma
>            Assignee: Aditya Sharma
>         Attachments: DATAMODELCHANGES.md
>
>
> The file will have the format:
> Entity Changes:
> Here we will have a bulleted list with entity names and the revision changes 
> took place
> 1. Added Entities
> 2. Removed Entities
> Field changes:
> Here we will show data in tabular form in format
> entityname | field | action | isPK | revision



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