IBM Cognos User Manual page 306

v you create an alternate drill-down structure that requires a unique convergence
v you specify that a level is unique and Cognos Transformer detects that it is not
v there is some other problem with the source data
Procedure
To resolve the problem, examine your source file and ensure that the data is valid
for your model.
TR2320
You are trying to sort a date level in descending order. This will create incorrect
relative-time calculations. Do you want to continue?
Cognos Transformer uses the ordered set of categories in a time dimension to
perform relative time calculations for relative time categories. If you reverse the
order of the categories in the time dimension by sorting them in descending order,
Cognos Transformer is no longer able to perform relative time calculations
correctly.
Procedure
To avoid this problem, when re-ordering categories in the time dimension, decide
which aspect of the model is most important: the order of categories within the
time dimension, or the relative time categories that are included within the time
dimension.
TR2321
A share object level must be an ancestor of a share target level.
You have tried to apply a share to one or more categories in a level when the share
that is currently set is at a lower level than the categories to which you are
applying the share.
Procedure
To avoid this problem, when you apply a share, make sure that the share is based
on an ancestor of the categories to which you are applying the share.
TR2322
A share object level must be in the same dimension as its target categories.
You have tried to apply a share to one or more categories when the share is
currently set to a category in another dimension. This is not supported.
Procedure
To avoid this problem, when you apply a share, make sure that the share is based
on an ancestor of the categories to which you are applying the share.
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IBM Cognos Transformer Version 10.1.1: User Guide
level, and the uniqueness property is not set