This portal is to open public enhancement requests against IBM Power Systems products, including IBM i. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).
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In IBM i release 7.4, the QMAXACTLVL system value is no longer used, so a poorly set QMAXACTLVL should no longer casue the CPF0908 message to be sent. It is still possible to set the MAXACT too low at the pool level, but once corrected you should not be repeatedly getting this error.
Reading the link you provided… it is up to you to adjust the pool (increase the activity level).