EPM 11.1.2.3 : Custom dimension name changed in upgradation process ?

hello all

we have upgraded our system from EPM 11.1.1.3 to EPM 11.1.2.2 and then EPM 11.1.2.3

and all application deployed

in this upgradation process we realise that dimension names got changed in EPM 122 /123

like in HFM , all the dimension name got changed.

so i changed it back to the same name as epm 113 but was not able to change Custom dimensions

as while validation it was giving error ,

Error Details

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Error : Generic dimension 'Custom1' was previously deployed with this application and no longer exists.  This is not allowed.

Error : Generic dimension 'Custom2' was previously deployed with this application and no longer exists.  This is not allowed.