This contribution proposes modifications to the existing semantic derivations of the subpicture height and width dimensions i.e., SubPicHeight and SubPicWidth. In the current working draft (WD 6) of the Versatile Video Coding (VVC), the semantic derivations for SubPicHeight and SubPicWidth result in incorrect values when the subpicture grid index (subpic_grid_idx) present in the last row (i.e., subpic_grid_idx[row][col]) is different from the grid index present directly above (i.e., subpic_grid_idx[row-1][col]) it and alternatively, when the subpicture grid index present in the last column (i.e., subpic_grid_idx[row][col]) is different from the subpicture grid index present in front of it (i.e., subpic_grid_idx[row][col-1]).