IBM Cognos User Manual page 304

TR2313
You are creating a level as a convergence level that connects two or more alternate
drill-down paths. Categories in convergence levels must have unique source
values. Is this level truly unique?
You have created a convergence level but have not designated it as unique.
Uniqueness is set by selecting the Unique check box on the Source tab of the
Level property sheet. Or in MDL, it is set by the option UniqueCategories True in
the Level definition statement.
Procedure
1. If you select Yes in answer to the message prompt, the setting is changed to
2. If you select No, the convergence level is not created.
TR2314
This is not a unique level.
This error indicates that you have a problem related to level uniqueness. This can
occur when
v you disable some error-checking options so that Cognos Transformer no longer
v you use multiple data sources in a model and do not define levels associated
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.
TR2316
The level level_name cannot be deleted because it is referenced by PowerCube
cube_name.
You have tried to delete a level that defines a PowerCube group, which is not
allowed.
Procedure
If you want to delete the level, you must first delete or modify the PowerCube
group so that Cognos Transformer no longer uses the categories in that level to
define which cubes are included in the cube group.
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IBM Cognos Transformer Version 10.1.1: User Guide
Unique and the required convergence level is automatically created.
verifies that unique levels contain unique categories
with columns from multiple data sources as unique
level, and the uniqueness property is not set