Can you try the by search for example http://<hostname>:<PortNumber>/rest/V1.0/list/MediaAsset/bySearch?query=MediaAssetDocument.Identifier equals "D12000100288267"&ArticleMediaAssetMap.identifiers equals "000000000000229568"
Thank you for your answer, but it also doesn't work.
The Media Asset is still being deleted from all the Article.
did you check the List API Delete documentation regarding "Delete sub entity records of objects returned by a report"?
You need to specify the qualificationFilter parameter which limits the sub-entity records.
First I would try to use the normal read list api to try to return the correct sub-entity record for ArticleMediaAssetMap, if the result is correct, you can fire the same url as http delete.
Sorry, I found out that I was looking into the wrong fields and therefore it couldn't work.
I found the solution and now it's working.
Answer : MediaAssetDocument was wrong. The qualifier to search was already in ArticleMediaAssetMap.
Thank you for your support.