src/main/java/org/efaps/ui/wicket/models/field/factories/NumberUIFactory.java
@Override
    protected String getReadOnlyValue(final AbstractUIField _abstractUIField)
        throws EFapsException
    {
        String strValue = "";
        final Object valueTmp = _abstractUIField.getValue()
                        .getReadOnlyValue(_abstractUIField.getParent().getMode());
        if (valueTmp instanceof Number) {
            strValue = String.valueOf(valueTmp);
        } else {
            strValue = valueTmp == null ? "" : String.valueOf(valueTmp);
        }
        return strValue;
    }
@Override
    protected String getReadOnlyValue(final AbstractUIField _abstractUIField)
        throws EFapsException
    {
        String strValue = "";
        final Object valueTmp = _abstractUIField.getValue()
                        .getReadOnlyValue(_abstractUIField.getParent().getMode());
        if (valueTmp instanceof Number) {
            strValue = String.valueOf(valueTmp);
        } else {
            strValue = valueTmp == null ? "" : String.valueOf(valueTmp);
        }
        return strValue;
    }
{@inheritDoc}