TR2706
Level level_name can't be reached in drill-down path drill_category_name for data source data_source_name.
A level must either be the first source level, be directly below a source level, or be designated as a unique level. All measures in data source data_source_name will have zero values in the PowerCube.
The level that is identified in the error message is not accessible in the listed drill-down path.
Procedure
To avoid this problem, ensure that all levels associated
with columns in a data source that do not contain their ancestor levels
are unique. Also, ensure that any identically-named columns exist
in one or more other data sources, and that these other data sources
also include the columns that generate categories for the ancestor
levels.