How to setup Custom-defined Heuristic?

Custom-defined Heuristic requires development of a Function Module typically copy from similar standard Heuristic Function Module. To make the Custom Function Module it needs to be maintained in table /SAPAPO/HEURFUNC. Then only the FM is available to be mapped to new Heuristic in SPOR Customizing (or transaction code /SAPAPO/CDPSC11). Refer to SAP Note 606260 also.