code: private boolean existsStrongerInColumn(INode source, INode target) {
          boolean result = false;
  
          char current = defautlMappings.getRelation(source, target);
  
          //compare with the other relations in the column
          for (INode i : defautlMappings.getSourceContext().getNodesList()) {
              if (i != source && defautlMappings.getRelation(i, target) != IMappingElement.IDK
                      && isPrecedent(defautlMappings.getRelation(i, target), current)) {
                  result = true;
                  break;
              }
          }
  
          return result;
      }
docs: Checks if there is no other stronger relation in the same column.
  
  @param source source node
  @param target target node
  @return true if exists stronger relation in the same column, false otherwise.