Process GEL script and Query erroring out post upgrade to 15.4

Document ID : KB000103716
Last Modified Date : 28/06/2018
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Issue:
We are having problems with a process GEL script and query (used in a portlet) after upgrading to 15.4. I have attached the GEL script and NSQL query script for reference.
Cause:
use of WM_CONCAT function has been removed from Oracle 12c.
Resolution:
CA PPM 15.3 and above will only support Oracle 12c or higher, and since 12c, Oracle have now removed the WM_CONCAT undocumented feature from their product.
Swapped out the WM_CONCAT function with LISTAGG. The queries and GEL script are running fine.