TPX started task is using REGION=5000K. We recommend REGION=0M.
5000K did not allow enough storage available to define slot 12 once TPX modules and other required items like the SMRT, SACBs, etc., were loaded. This is evident in the TPXOPER display above with the zero value for slot 12 Count and Bytes.
In this situation, TPX managed by using Dynamic Storage Area (DSA) when otherwise slot 12 below the line would have been used.
Change REGION=5000K to REGION=0M and restart TPX.