Strange behavior of Date Picker

Question

APEX 3.2.1.00.10
For some reason when I place the cursor on the Date Picker input text area and press <enter>, the page submits and I'm redirected to a URL of: http://[apex url removed here]/wwv_flow.accept. This page has the following message:
"ERR-1777: Page 27 provided no page to branch to. Please report this error to your application administrator."
Restart Application
The Date Picker item on a page (page 27) is specified as:
Name: P27_BEG_DATE
Display as: Date Picker (MM/DD/YYYY)
Source Used: Only when current value in session state is null
Source Type: Static Assignment (value equals source attribute)
Format Mask: MM/DD/YYYY
Default Value:
DECLARE
  v_date DATE;
BEGIN
  SELECT trunc(SYSDATE,'YEAR')
    INTO v_date
    FROM dual;
  RETURN TO_CHAR(v_date,'MM/DD/YYYY');
END;
Default Value Type: PL/SQL Function Body
This item is conditionally displayed and strangely enough, there are no processes or branches that are triggered on this particular item that would cause the page to submit. This behavior is present in both IE and FireFox. Any ideas?

Answer 1

I have resolved the issue. I'm not sure if this is the behavior of all browsers (as the thread below indicates) or whether it is an APEX bug, but adding the following HTML to the Header Text attribute of my page prevents the page from submitting. Apparently when a page has a single input field (as in the case with input field associated with my Date Picker item), the browser will submit the page when <enter> is pressed even though page branching is not defined for such circumstance.
<!-- Dummy input created to prevent submit of page -->
<input type="text" style="border:0;" disabled="disabled" />OTN thread regarding page submit when single input on page:
[Link here|http://forums.oracle.com/forums/thread.jspa?messageID=2184305]