Hello
Call Tx SE38 and execute the program RSNTABCONSISTENCY or RSDDCHECK for a consistency check.
Select "Individual Objects". Enter AFVC and execute.
Try to activate the structure AFVC from Tx SE11.
If it throws an error then call Tx SE37 and execute the function module DD_NAMETAB_DELETE against the structure AFVC.
Once done activate the structure AFVC from Tx SE11.
Good Luck
RB