Process Chain trigger by another background user

hi all,

       i have a problem, my process chain execute everyday, and i have a large infopackage to load, it spends about 2 hours, my process chain trigger by the background user ALEREMOTE usually, and these days i found a problem, some DTP nodes trigger by another user BWREMOTE, and the DTP nodes triggered twice, i found that the infopackage node's IDoc send and back about spend 90-110 minutes, in this case, the DTP nodes would trigger by the user BWREMOTE, i want to know how to set some parameters or other things to stop the user BWREMOTE to trigger the DTP nodes. 

best regards

jason zheng