JDeveloper 10.1.2.3 Row Insert Update issue

All,
We have a problem we hope you can help solve, using JDeveloper 10.1.2.3.0 with JHeadStart 10.1.3.3.87 and its easy to reporduce and its a bad one.
Create a simple web project > Create Entity/VO for one table > Enable JHeadStart >
Use JHS to create Master Detail drill down single record
Run app > Open Browser to the Master list > press button Create X to bring up a new row NOW open another browser TAB and do the same so we have 2 forms open in INSERT mode.
Press Save on 1st tab to trigger the Insert - fine it reloads the form after commit and row is in the DB THEN switch to the other tab and submit that one > this one will overwire the record you entered 1st.
This is bad and its happening often when we load the system with many users event without multiple (multiple tabs makes it easy to test) - trapping the doDML we expect the 2nd insert request to be DML_INSERT but we get DML_UPDATE. Depending on refresh setting on some attributes we will get error back JBO-25014 but if no refresh on insert update you still get the same issue only one row in db and 1st row gets over written.
If you have any ideas what is going on and how to solve this ASAP that would be great.
Thank you
Anthony

Steven,
Thanks for the entry. Yes, we realized that the two-tab browser scenario was the same session. The thing that baffled us was why our test without JHS allowed two inserts in a two-tab, same session situation whereas with JHS, the second insert did an update on the first record committed. We suspected it had something to do with how the current row pointer in the view cache/entity cache was being handled.
The main symptom we started with was that users in separate sessions in production are overwriting each other's records; and we agree with you, it is surprising but we can reproduce it when traffic is "heavy" (more than four users usually) or the operations are rapid fire -- less than a minute between User 1 inserting a record and User 2 inserting a record. The second user insert operation acutally updates user 1's record even though the data for both inserts is different.
We switched EnableTokenValidation to "true" and this "fixes" the two-tab, single session situation -- the second insert presents a row currency JBO error (much better than overwriting the first record). In a two-user session scenario, the effect is worse with this setting: the second user trying to insert actually updates a different record from the record the first user just inserted.
This seems to point to users sharing a view/entity cache and it seems like that might be an ADF or maybe an OC4J bug -- we are using datasources on OAS and an HTTPS protocol for this app.
So next we are going to try using a database procedure that overrides the Save operation on new (and updated) records. If the database procedure sees a negative ID (from DBSequence) it will insert regardless of the current record pointer. If the database procedure sees a positive ID, it will update that record. I think we'll also need to roll back the CreateInsert that got us to the new record screen, too. Messy, yes, but if this effect is due to an ADF 10.1.3 bug, rewriting the app in 11g would take much longer.
Our other ADF JHS 10.1.3 apps do not have this problem as far as we know, but they do not use datasources or HTTPS.
Peter

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