Problem with new DB app, report+form, report works great, form says ORA-01403: no data found

Question

I have a new table, the PK is a varchar2(5) column, when I allow the default query in the report to do its work, I get all the expected data.  when I click on the edit icon (pencil), I get an error screen indicating ORA-01403: no data found.  I'm hosed!  This was generated by the app!  no changes were made to anything in the app, except to turn off tabs at create time.  I even left the default name.
My ARF is hitting the right table with the PK column, but finds nothing.  I have the "success" message showing me the PK value.  What could be going on here, and how can it be addressed?  Today is the 1st time I have seen this matter.
I'm running 4.22 as the workspace admin, I have other apps that work fine (to expectation), my browser is FF22, though I plan a downgrade to 18.  Our DB is 11.1.0.7.

Answer 1

Jorge, thanks for your attention to my problem, I appreciate any insights, although there is a little clarification I can offer.  Also, if you can, please remind me the tags to use in my text that would properly set off the code snippets or prior message content?
[you wrote]
You said you have a "success" message showing you the PK value. Can you elaborate on this?
The form page, under the ARF, allows for the display of a "success" message and a "failure" message.  I have seen my "success" message appear, but it didn't show my key field as a brought-back value (which I told it to include), and I think now this is not relevant any longer.  I found that there was a link on the report attributes page between #ROWID# and a P2_ROWID that was incorrect (probably from an earlier stage of dev in the app), and I changed this to my key field, and this altered the outcome of the ARF action.  This leads to ....
[you wrote]
Can you see the correct PK value in the URL? Does the item parameter match what you expect (correct page item and value)? Perhaps share that full URL here?
I have expected values in my URL.  The URL does show my key value (tail end of URL underlined here):
../apex/f?p=120:2:7519563874482::NO::P2_VCODE:RB15
[you wrote]
Debug the page and see which process, item or step is actually failing. You could be running some other process on the form page and that could be what actually fails.  Treat it as if the ARF works correctly and see what else could be happening.
I can add the detail that my 1st message was based on testing with a table where I set the PK as data type VARCHAR2, but in more testing on the actual app (whose URL piece is above) I am using a PK which is CHAR.
The result of the debug effort is that APEX has built its own query for pulling back the row in the ARF, and it is joining on my PK field to an APEX item P_ROWID which I don't think I created.  Nor does it appear to offer me any avenue for correcting it.    debug snippet:    where "VCODE" = :p_rowid; end;