If you have a list of the custom datatypes for your source data, then map each custom datatype to an appropriate archive datatype before you run the Data Vault Loader job. If you do not have a list of the custom datatypes, start the Data Vault Loader job. The Data Vault Loader job fails If you have unmapped datatypes. Open the job log to view the list of unmapped datatypes. Create maps for each datatype on the list and restart the Data Vault Loader job.