IBM Cognos User Manual page 308

You have specified a column to supply a description for the categories in a level,
and Cognos Transformer is unable to find the column that you specified.
Procedure
To avoid this problem, ensure that the column name you specify matches one that
is defined in a data source for your model.
TR2502
A view was expected but not found. Either you have referred to a view by an
object name or object identifier that Cognos Transformer is unable to locate, or you
have not referenced the view.
This error occurs when MDL syntax requires an object and is unable to find it. In
this case, the object is a view.
The problem may be that the view was not referenced, or that it was referenced
with an incorrect object name or object identifier.
Procedure
You can verify Cognos Transformer object names and identifiers on the Windows
interface. To make them visible, select the Object name and Object identifier
check boxes on the Titles tab of the Preferences property sheet. The object name
and identifier will appear in the title bar at the top of each property sheet, and also
in a tool tip when your pointer hovers over an object.
You can also find object identifiers in the .mdl file. For more information, see the
Cognos Transformer Developer Guide.
TR2503
Special categories cannot be summarized in dimension views.
This error typically appears in the log file in response to an action requested by an
MDL script. Under normal circumstances, the Windows interface does not allow
you to perform exclude, summarize, or cloak actions on special categories in a
dimension view.
Procedure
If you encounter this error, ensure that the category object identifier that you
specified in the CatUpdate or CatMake statement does not refer to a special category.
You can find object identifiers in the .mdl file. For more information, see the
Cognos Transformer Developer Guide.
TR2504
Special categories cannot be suppressed in dimension views.
This error typically appears in the log file in response to an action requested by an
MDL script. Under normal circumstances, the Windows interface does not allow
you to perform exclude, summarize, or cloak actions on special categories in a
dimension view.
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IBM Cognos Transformer Version 10.1.1: User Guide