When importing or re-importing data into rightsHUB via the Content Manager - Imports area, you should be aware of the maximum number of Rows per Import:
Releases - 30k Rows
Assets - 60k Rows
Works - 30k Rows
Any imports with more than the permitted number of Rows will be rejected. If you have data you wish to import above these limits, please ensure you spilt your Import files into separate files to import one by one.