Dear Animesh,
Please check the following:
under CRM -> Marketing -> Marketing Planning and Campaign Management -> Integrated Marketing Calendar -> Define Structures
1. You should have a Structure ID for 'Hierarchy View'.
2. Selecting it and drilling down into 'Define Structure hier' ... you should have a cluster combination with 'all levels' selected.
3. Going up to the section Settings for Clusters -> "Define Clusters"you need to ensure that all your project types (MP, MPE, TP) are part of the Master Cluster (i.e. cluster ID #8 in this case)
4. Finally, in addition to the view #2 mentioned by Nikhil above, check that you have the following settings under Settings for Combination of View or Grouping Rule and Cluster --> "Define Cluster Combination...
Hope this helps. Let me know.
Anik
SAP Solution Manager