Teradata query not finishing when executed from DataStage

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Teradata query not finishing when executed from DataStage

Hello all,
I have a developer running a process using Datastage 8
A query is executed on Teradata but does'nt finish.
From Pmon the session is idle and pe state is response. It stayed in this state all weekend.
If I run the query outside of DS it executes in less than a minute and returns 21 mil rows.

Any Ideas?

thanks, Tbob