IReportRunnable design = getReportDesign();
Module module = design.getDesignHandle().getModule();
List<DesignElement> allElements = module.getAllElements();
int unusualColumnCounter = 0;

Set<String> legalItems = DBTools.getAllColumnNames();

for (DesignElement designElement : allElements) {
    DesignElementHandle handle = designElement.getHandle(module);
    if (handle instanceof ReportItemHandle || handle instanceof DataItemHandle) {

        // !!!
        if (handle instanceof ReportItemHandle) {
            ReportItemHandle reportItemHandle = (ReportItemHandle) handle;
            Iterator columnBindingsIterator = reportItemHandle.columnBindingsIterator();
            while (columnBindingsIterator.hasNext()) {
                ComputedColumnHandle computedHandle = (ComputedColumnHandle) columnBindingsIterator.next();
                if (computedHandle != null) { // ???
                    String computed = computedHandle.getName();
                    if (!legalItems.contains(computed)) {
                        reportItemHandle.removedColumnBinding(computed);
                        unusualColumnCounter++;
                    }
                }
            }
        }
    }
}