Description:
TIBCO ActiveMatrix BPM (AMX BPM) uses Event Collector (EC) data for auditing purpose. By default, the attribute data (Attribute1 to Attribute 40) are not populated in the EC_WI_STATUS table for the work items of the instances as mapped in the design time using TIBCO Business Studio.

CentralECAuditProcess should be enabled in the ec-probe-rules.xml file as detailed below.

1). Go to AMX BPM config_home and find ec-probe-rules.xml file. Generally it will be under <Config_Home>\tibco\data\bpm\amx.bpm.app\configuration .
2). Make a back up of the original file.
3). At around line 267, change from "CentralECAuditProcessExclusions" to "CentralECAuditProcess".

Example.
                <action>
                    <messageProcess>CentralECAuditProcess</messageProcess>
                </action>

4). Make sure the change is done only once and at only the mentioned place though the file may have more than one entry.
5). Upon saving the change, the EC_WI_STATUS table should populate data per the process design.

Note that the node restart is not required for the changes to take effect.

EC_WI_STATUS table does not populate attribute data for process instances.

https://docs.tibco.com/pub/amx-bpm/3.1.0/doc/html/bpmhelp/GUID-DDB5F613-B49E-43DB-8997-9A5935A4B67A.html