On August 20th, the fourth Bundle Patch (patch id 21640312) was released for BPM Suite 12.1.3. The notes unfortunately specify: This patch is mutually exclusive with all SOA Bundle Patches after SOA Bundle Patch 1. For example, if you attempt to apply this patch on top of SOA Bundle Patch 2, all fixes from SOA Bundle Patch 2 will be rolled back.
Details on this Bundle Patch are available from Oracle Support: BPM 12c Bundle Patch Reference (Doc ID 1983445.1).
Oracle released Bundle Patch 2 for SOA Suite 12.1.3 in April 2015 and Patch 3 in July 2015.Navigate here for an overview of all Bundle Patches for Fusion Middleware 11g and 12c
Download the Bundle Patches from My Oracle Support: https://support.oracle.com/epmos/faces/DocContentDisplay?_afrLoop=521750086943457&id=1485949.1&_afrWindowMode=0&_adf.ctrl-state=ggjd5lum8_9 .
Instructions on installing the Bundle Patches on top of either the base 12.1.3 installation or on Bundle Patch 1 (January 2015) are provided in this Blog Article by Jan van Zoggel: http://www.rubix.nl/blogs/patching-your-jdeveloper-1213-soa-bundle-patch-121302 .