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For IBM i versions prior to 7.2, PTFs are required for this setting to have an effect.  The PTFs have been out for quite some time, so most customers are likely to have them.  Here is a list of the required PTFs:

Release             57**DG1 PTF          57 57**SS1 PASE PTF 
i 5.4         SI41577, SI41688     SI41324 
i 6.1         SI41253, SI41704     SI41326 
i 7.1
IBM i V7R1         SI41367, SI41706     SI41325

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