The Holds API let you place multiple holds against the same item, while the OPAC and Staff Interface will prevent you from placing a hold on the same item for the same patron twice.
Does this still apply? Look: https://git.koha-community.org/Koha-community/Koha/src/commit/efc39ed8ef583258a8cf8ea7f6da142995d0bc4b/Koha/REST/V1/Holds.pm#L91 Rules can only be overridden if the syspref is enabled, and the API is sent the `x-koha-override` header with the right value.
Hi Thomas, I think David is speaking about something else, Some of the controls are wrongly implemented into the pl files instead of centralized in C4/Reserves.pm. This creates inconsistencies in how the controls are done depending of how a reservation is made, from the interface or ILS-DI or API. If I understand David right, I think this ticket is a duplicate of this omnibus bug : 30845. Best, Arthur *** This bug has been marked as a duplicate of bug 30845 ***