# Requirements for source data

- All PERSON_ID values that you import must have 9 or fewer digits, or transformation fails.
- At least one OBSERVATION_PERIOD row must exist for each person.
- If you varied from the default Common Data Model Version 4 and added an Age column to the PERSON table, and you want to import this column, the name of the column must:
  - Contain 30 or fewer characters.
  - Begin with an alphabetic character.
  - Contain only the following characters:
    - Alphanumeric characters
    - Underscores (_)
    - Dollar signs ($)
    - Number signs (#)

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