The dynamic action didn't work

Apex 4.1
There are 2 items in a Form on Page 3,  P3_REG_ID and P3_SUBMITTER_ID.
I'd like set submitter id=reg_id when reg_id has been change, so created the dynamic action on item P3_REG_ID, but P3_submitter_id didn't change whatever P3_reg_id did.
What I did:
{code}
Event: Change
Selection Type: Item
Item: P3_REG_ID
Conditions: null
True action:
Set type: PL/SQL Expression
PL/SQL Expression: : P3_REG_ID
Effected elements
Selection type: Item
{code}
Who can help me? thanks a lot
Item: P3_SUBMITTER_ID

Hi Howard,
I have requested the example workspace in OTN, and created a application, please reference.
http://apex.oracle.com/pls/apex/f?p=4550:1:0:::::
workspace:  huangyong
usename: test
password: 1234

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