I can not associate a DOI with a particular article.
The OJS runs the error:
Errors occurred processing this form[The given DOI suffix is already in use for another published item. Please enter a unique DOI suffix for each item.]
I also could not find the DOI in the database:
select * from submission_settings where setting_name = ‘pub-id :: doi’ and setting_value like ‘%[DOI Prefix / DOI Suffix]%’;
@bozana
So far as I know, we use DOI only in articles.
I double checked the configuration of the doi plugin. Just articles.
I’m searching for ‘10.1108/INMR-03-2018-0013’
I assume you are using 3.x version. If custom suffix is used, it will be first saved with/as that setting_name. Then, first when you assign the DOI (select the appropriate check-box and save the form), the DOI will be assigned and saved with/as the setting_name pub-id::doi.
When custom suffixes are used, every time you save the suffix/form, it will be checked if there is already a same DOI and a same suffix (because it could be saved/created but not assigned yet). Thus, it seems that you already created/saved such a suffix for another object/article, but haven’t assigned the DOI to that article yet.