Workflow Container Element Not Updated

Hi,

I have a really simple task here to update a container element LAST_APPROVER within function module for Agent Determination. The problem is the container element will never be updated.

By looking at my workflow coding/setting below, could someone please share what I did wrong? Thanks.

Rule Binding:

Rule Container:

Function Module:

The return code from SWC_SET_ELEMENT statement is 0.

SWIA:

Container element LAST_APPROVER is not updated.