SMSc:Display URL remains unchanged when modified and clicked on the "default" button.

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Project: YELL SMSc
App. URL:
http://yell-qa-mms1.ri.thesearchagency.com:8080/Customization/com.thesearchagency.mms.customization.gui.Application/Application.html#page-bpid
Browsers Tested: IE6
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When the Display URL is modified and the 'default;' button is clicked,though
the save is changed successfuly,it is found that the Display URL is not changed
to new value though set to default.

Steps to reproduce:

1. Login to the YELL SMSc home page with a valid credentials and valid SAP Id.
2. In the Campaign Settings tab,under the 'Click URL' attirbute click on the
link [edit] on anyone row.
3. Now in the Display URL column.delete the existing URL,type a new URLand click
on the 'default' button and observe

Expected Result:
The new URL should be set as default.If not a proper response message should be
thrown instead of "Success!Changes Saved" message.

Actual Result:
The new URL does not exits instead the deleted URL is found in place,though
after changing it and clicking on "default" button gives "Success!Changes Saved"
message.