The cross-reference table for a base object contains the most recent value from each source system. By default (without trust settings), the base object contains the most recent value no matter which source system it comes from.

For trust-enabled columns, the cell value in a base object record might not have the same value as its corresponding record in the cross-reference table. Validation rules, which are run during the load process after trust calculations, can downgrade trust for a cell so that a source that had previously provided the cell value might not update the cell.