Hi, tchd
Thanks your attention on Talend. For your issue description, I just say yes, the batch model and extended insert can't used with reject together. The reject option requires the data to be processed one by one. Usually, we need to do some validation before loading them to target system, to avoid the error can be predicted, for example, use tSchemaComplianceCheck to check the length of data, null value, and date.
Best Regards
Sabrina