Problem extending a VO with transient attributes

I am trying to extend a VO that is based on a query with a Binding Style of Oracle Positional.
The Attributes that are listed for the original VO are the attributes from the Query Statement plus some transient attributes.
I extended the VO by modifying the query. Added my two columns at the END of the Select statement.
Successfully substituted the VO but I am getting a runtime error when saving a record.
Reviewed the extended VO and noticed that the new columns are listed as attributes AFTER the transient attributes.
This could be the cause of the runtime error since one of the transient attributes listed after the query attributes is RowChanged.
How can I force my new attributes to be positioned BEFORE the transient attributes?
Is this the problem or is it something else?
Thanks for any suggestions.

Runtime error:
java.lang.NullPointerException
at oracle.apps.pos.supplier.server.ByrSuppAMImpl.validateDffVo(ByrSuppAMImpl.java:3575)
Yes, I have checked the attributes (Updateable Always, etc.) and the attribute mappings and they all seem fine.
My two new attributes are at the end of the original attributes. I think my new attributes should NOT be at the end of the original attributes because the original VO.xml has attributes from the query and then transient attributes that are not from the query. My extended VO now has the attributes from the original query, the transient attributes, and then my new attributes from the query.
The first two transient attributes are RowChanged and RenderFlex and it seems like OAF is confusing it with my new attributes because:
(1) the runtime error I get when saving (RowChanged attribute)
(2) the Flex field icon grays out after my VO extension was deployed (RenderFlex attribute)
To test out my theory, I would like to move my new attributes to be listed BEFORE the transient attributes.
I tried editing the VO.xml file by moving my new attributes (query-related) to the end of the other query-related attributes and before the transient attributes (that are not query-related). When I try to view my changes inside JDeveloper, the attributes are shown in the new order (on the left) but the query mappings are still listed in the old order.
Where can I re-order the query mappings? Tried using the up/down arrows on the right but it's grayed out.
If I re-order the attributes in the VO.xml file and save it, is that all the change I need to do?
Thanks.

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