Hello Dulip
Thanks for your message.
From the error that you received, I can see that you are trying to upload content to DOAJ that already exists in our index. However, your upload is trying to change the DOI or full text URL of some content. That operation is not allowed because DOAJ uses DOI and/or full text URL to match articles.
If you are updating URLs or DOI intentionally then you should contact
help...@doaj.org and let them know the details of the articles that you are trying to update and how many there are.
Let me know if you have any questions,.
best, Dom
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Dominic Mitchell
DOAJ Operations Manager