Attempting to remove from a shelf being used in a repeat over, an item which is less than or equal to the size of the shelf at the start of the repeat over.
          #6072   Run-time catchable error
          Attempting to remove from a shelf being used in a repeat over, an item which is less than or equal to the size of the shelf at the start of the repeat over.
Additional Information
 For X shelf Y, item Z, repeat over size of A.
     where X is either counter, stream or switch.
Explanation
The repeat over temporarily freezes the minimum size of a shelf.
OmniMark has tried to remove an item whose position is at or inside this
minimum size.