During the copy to destination step, the validation process calculates a checksum value for each column in every table in the retirement entity.
The validation process stores the column checksum values in the ILM repository. When the Data Vault loader is finished, Data Vault calculates another checksum value for each column and compares it to the checksum value stored in the ILM repository. You can then review the validation for any deviations that occur between the two checksum values for each column.