Conditional Property does not work as expected

The conditional property works fine as long as it is set in a Control. But it suddenly fails with errors right after setting it in another different Control as below.

1) From Conditional Expression Manager, create a new Condition as below.

2) From Application Designer, open the WOTRACK record and select "Add/Modify Signature Options" from the "Select Action" menu.

3) On "Add/Modify Signature Options" window, create the following option:

4) Click the "Export Application Definition" button to export WOTRACK.xml.

5) Add the following entries before "Address Information" section on the main tab into WOTRACK.xml

<section id="main_s010" sigoption="TESTOPT01">
    <table id="main_t010" label="Attached Documents" relationship="DOCLINKS">
        <tablebody id="main_t010_body">
            <tablecol dataattribute="document" id="main_t010_body_c1" inputmode="readonly" label="Docment ID" type="openurl" urlattribute="weburl"/>
            <tablecol dataattribute="docinfo.description" id="main_t010_body_c2" inputmode="readonly" label="Document Name" sortable="false"/>
            <tablecol dataattribute="docinfo.DESCRIPTION_LONGDESCRIPTION" id="main_t010_body_c3" label="Document Description" width="200"/>
            <tablecol filterable="false" id="main_t010_body_c4" mxevent="toggledeleterow" mxevent_desc="Delete Row" mxevent_icon="btn_garbage.gif" sortable="false" type="event"/>
        </tablebody>
        <buttongroup id="main_t010_body_buttons">
            <pushbutton default="true" id="main_t010_body_buttons_b1" label="Add Attachment" mxevent="draddnewattachmentfile"/>
        </buttongroup>
    </table>
</section>

6) Import WOTRACK.xml that was modified in the last step by clicking "Import Application Definition" button.

7) Select the added section and click the "Control Properties" button.

8) On the "Advanced" subtab, click the "Configure Conditional Properties" button.

9) For "Security Groups", add the entry for MAXADMIN.

10) For "Conditions for Security Group MAXADMIN", add the following entry:

11) For "Property Values for Condition TEST01", add the following entry on the "Condition is true" subtab.

12) For "Property Values for Condition TEST01", add the following entry on the "Condition is false" subtab.

13) From "Security Groups", open MAXADMIN and grant MAXADMIN the access to the option "TESTOPT01" for the Work Order Tracking application.

14) Sign out and sign in with MAXADMIN.

15) From "Work Order Tracking", click "New Work Order" and then "Save Work Order".

16) On the "Work Order" tab, in the "Attached Documents" section, click the "Add Attachment" button.

17) On the "Create a File Attachment" window, specify a file and click OK to close the window.

18) Confirm the file is successfully attached.

19) From "Application Designer", open WOTRACK.

20) On the "Work Order" tab, select "Priority" field and click the "Control Properties" button.

21) On the "Advanced" subtab, specify "TESTOPT01" in the "Signature Option" field and click OK to close the window. Then save the changes.

22) From "Work Order Tracking", click "New Work Order" and then "Save Work Order".

23) On the "Work Order" tab, in the "Attached Documents" section, click the "Add Attachment" button.

24) On the "Create a File Attachment" window, specify a file and click OK but the following error is displayed.