Unable to make Quantity Column Read-Only in PO Lines in R12 iProcurement

Question

Hello Everyone,
My Requirement is if a PO is coming from a requisition and it has Requisition Number populated in PO Distribution, I want to make Quantity column Read only in the PO Lines. This column can be updated for all the lines in standard page by clicking Update button(which makes Quantity enterable).
I have tried following using SPEL Binding. But it seems SPEL Binding is not working as expected. I am pasting the code below :
I have created a Transient Attribute of Boolean Type in the VO and have placed it in SPEL Binding for the Quantity Bean. On click of Update button I am conditionally setting the transient VO attribute to False.
if(oapagecontext.getParameter("UpdateButton") != null){
super.processFormRequest(oapagecontext, oawebbean);
OAViewObject vo=(OAViewObject)am.findViewObject("PoDistributionsMergeVO");
String x=(String)vo.first().getAttribute("OnlineReqNumber");
OAMessageTextInputBean msgTextBean = (OAMessageTextInputBean)oawebbean.findIndexedChildRecursive("QuantityOrdered");
Row row=vo.first();
if (x!=null) {          
do{
row.setAttribute("QuantityRendered",Boolean.FALSE);
row=vo.next();
}while(row!=null);
Thanks in Advance,
Abhishek Mishra

Answer 1

Abhishek,
Your code seems pretty fine. There are few things
1) Post the Spell, which you have attached with the rendered property.
2) Had you initialized your VO (where your transient variable exists).
For a work around i would suggest you to create a new VO and create a transient variable. Now try the same using this VO.
Regards,
Gyan