Removes the checkpoint associated with the ItemNo-th item.
function RemoveCheckpoint(ItemNo: Integer): Boolean;
ItemNo – index of the item. Items are indexed from 0 to ItemCount-1. Items of subdocuments (table cells) are not included in the items range of the main document; for items in cells, use Cell.GetRVData.RemoveCheckpoint.
If the ItemNo-th item does not have a checkpoint, this method does nothing.
Methods type: 
viewer-style.
Repainting may be needed if rvoShowCheckpoints in Options.
See also methods of TRichView:
See also properties:
See also methods of RichViewEdit:
See also:
▪"Checkpoints";