COBCH1726 ILSMARTLINKAGE class `<class-name>` has multiple definitions

The ILSMARTLINKAGE directive has caused the generation of more than one class with the same name.

In the following example, compilation would result in two classes named grp1. To fix the error, rename one of the 01 level items.

$set ilsmartlinkage
 program-id a.
 linkage section.
 01 grp1.  *> rename one of these items
    03 nam pic x(20).
 procedure division using grp1. 
  ...
 end program.

 program-id b.
 linkage section.
 01 grp1.  *> rename one of these items
    03 num pic 9(9).
 procedure division using grp1.
  ...
 end program.

COBCH1726 ILSMARTLINKAGE class <class-name> has multiple definitions

COBCH1726 ILSMARTLINKAGE class `<class-name>` has multiple definitions