I don't know if it's related to the SUSHI protocol itself (in that case there is nothing to do...) or to Koha, but it's annoying. Ex : for a data source if you try to harvest march and april 2025, and april data are not available, the harvest will fail with this error : Sushi harvesting return an error if some months are not available : Usage Not Ready for Requested Dates - Usage not yet released for the following yearmonths(s): 202504 3031