Library /sys$common/syshlp/basichelp.hlb Run time errors, PRIKEYOUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Primary key out of sequence (ERR=158)

  A sequential PUT to an INDEXED file  specifies  a  PRIMARY  KEY  value
  lower  than  that  of  the  preceding record.  Sort the records before
  using PUT on an indexed file.