i_MaxPromoCodeImportErrorThreshold
This setting defines the maximum number of errors that can occur while importing promotion codes before the import transaction is stopped. So, if the setting is 100, the import fails and the transactions roll back if the promotion code import file contains more than 100 codes that cannot be imported due to errors (for example, code already exists in database, code length is too long, code contains characters that are not valid, and so on). The default value is 100.