question on ORA-02049: timeout: distributed transaction waiting for lock

Oracle 10gR2.
We have a croned MV refresh process (originated from Test, copying T1 data from Production to Test) that a couple of time fails with this message:

BEGIN dbms_mview.refresh('T1'); END;

*
ERROR at line 1:

ORA-12008: error in materialized view refresh path 
ORA-02049: timeout: distributed transaction waiting for lock 
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2255 
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2461 
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2430 
ORA-06512: at line 1 

My question is, does the lock is on the T1 of Test or Production DB? I would think there was some process that was updating T1 table on Production while this MV refresh started, Am I right?

TIA Guang Mei
www.eversave.com

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