|Mandatory||Repeatable||Data Type||Authority||Level Available||A/V Only||Public Element|
|No||Yes||Variable Character Length (60)||None||Series
|Definition:||The unique identifier assigned to a group of archival materials that have been transferred into the legal custody of NARA.|
|Purpose:||Links the description of the archival materials and their acquisition/accession documentation. Will help NARA to create linkages in lifecycle systems.|
|Relationship:||This element is independent.|
Enter the accession number exactly as it appears on the source accessioning documentation. Do not include notes or explanations in this element.
For preliminary descriptions of Federal records, Accession Number should be entered if available.