XML not rendering correctly in ABAP webdynpro after upgrade to 7.5

We are displaying XML content using ABAP webdynpro . We are on 7.5 system and were on 7.31 before. XML was correctly displaying before upgrade.

After upgrade, the same xml content is displaying without xml tags.

In 7.5 the content

EDI_DC40200000000000166518

in 7.31, the content

<?xml version="1.0" encoding="UTF-8" ?>
- <DELVRY03>
- <IDOC BEGIN="1">
- <EDI_DC40 SEGMENT="1">

<MANDT>200</MANDT>

<DOCNUM>0000000001665189</DOCNUM>

I was not involved in the original development and not familiar with webdynpro . Any ideas?

When I tried to look at the 'Technical Help' -> View and View elements tab , 7.5 version dumps with 500 internal error while the 7.31 version displays correctly.