After objects are mapped for comparison and synchronization, you may encounter warnings on the Mapping page of the Data Comparison wizard. The warnings may be divided into two groups. They are table-level warnings and column level warnings.
Table-level warnings are displayed as a warning icon in the column with check boxes on the Mapping page of the Data Comparison wizard. Object pairs with table-level warnings are not compared. They are displayed with a warning icon instead of check box in the Data Comparison document.
Column-level warnings are displayed as a warning icon in the Columns in Comparison column on the Mapping page of the Data Comparison wizard. They also appear in the Target column in the Column Mapping dialog box. Such warnings mean that some columns of a compared object pair cannot be compared because of type incompatibility or that you may encounter data loss when synchronizing data.
To read the warning messages, point to the warning icon. All warnings for this object will appear in the hint.
The following table contains information about table-level warnings and ways to remove them.
The following table contains information about column-level warnings.
You may exclude columns from comparison and synchronization either by unmapping them or by clearing the check boxes in the first column of the Select columns for comparison grid on the Column Mapping dialog box.