The user had upgraded to OpenLAB CDS ChemStation C.01.05 form B rev LeoChem. Their OI Analytical XSD (halide detector) was listed in OpenLAB CDS as 'not recognized'.
The user had edited their config as 6890 Classic, but it still did not work.
Deleting Inst1, followed by Add Inst1... that worked. Their detector is now recognized by OpenLAB CDS.