Change Order (modify) does not change Markfor address

Symptom

PART: API-OM 5.5 Platform
PRODUCT: Distributed Order Management
COMPONENT: changeOrder
OS: HP-UX - 11i
DATABASE: Oracle - 9.2.0.4
WEB SERVER: WebLogic - 8.1 SP2
WEB BROWSER: Internet Explorer - 6.0 sp1

Change Order (modify) does not change Markfor address

Steps to Simulate :
1. Create an Order using this XML
<Order EnterpriseCode="DEFAULT" >
<OrderLines>
<OrderLine OrderedQty="1" PrimeLineNo="48" SubLineNo="64">
<Item ItemID="ABC" />
<PersonInfoMarkFor AddressLine1="First" />
</OrderLine>
</OrderLines>
<PersonInfoShipTo AddressLine1="1" />
<PersonInfoBillTo AddressLine1="1" />
</Order>

2. Check from the UI, and on the line, see that the information for MarkFor is Displayed in the ForwardTo Innerpanel.

3. Now run this for changeOrder
<Order Action="MODIFY" OrderHeaderKey="2004051811422352152" >
<OrderLines>
<OrderLine Action="MODIFY" PrimeLineNo="48" SubLineNo="64">
<PersonInfoMarkFor AddressLine1="Hello Again" />
</OrderLine>
</OrderLines>
</Order>

4. Check from the UI, the *changed* address is populated in the Shipto Innerpanel on the UI.
5. Do more changeOrders, to confirm that MarkFor is actually going to ShipTo.
6. Now do a changeOrder as follows :
<Order Action="MODIFY" OrderHeaderKey="2004051811422352152" >
<OrderLines>
<OrderLine Action="MODIFY" PrimeLineNo="48" SubLineNo="64">
<PersonInfoMarkFor AddressLine1="Hello Again" />
<PersonInfoShipTo AddressLine1="Ship To" />
</OrderLine>
</OrderLines>
</Order>

7. Note that the MarkFor change is ignored.