Schema difference error when verifying project

I am in the process of upgrading from QC11 to ALM 11.52 and some projects are throwing following error when I try to do verification after the upgrade. Only some of the projects have this issue not all. Below is the exact error from verification report:

17/07/2014 17:09:26: Verifying the project schema ...

17/07/2014 17:09:27: ALM-V10017: Error: A schema difference that cannot be automatically corrected has been detected: DBUCorrectionRemoveIndexEvent:Index name-->FP_COMPONENT_PARAM_IDXTable name-->FRAMEWORK_PARAM

17/07/2014 17:09:27:    ALM-V10055: Schema differences were found

Thanks for your help!