When an overlapping PERFORM range has been detected, this error message indicates the start of the first affected range and the number of overlapping PERFORM ranges.
Refer to COBCH1664 Perform range: <procedure-name1> thru <procedure-name2> for more details on where those overlaps occur.
$set ilshowperformoverlap ... perform a thru c. perform c thru f. perform f. goback. *> errors are displayed as follows: a section. display "Running section a.". *> COBCH1663E Overlapping perform range: 3 entries *> COBCH1664E perform range: a thru c b section. display "Running section b.". c section. *> COBCH1664E perform range: c thru f display "Running section c.". d section. display "Running section d.". e section. display "Running section e.". f section. *> COBCH1664E perform range: f thru f display "Running section f.".