Updating field definitions in installation's @CFDE macro. It might involve expending or shrinking the length of some field within this.
What should be done to the value of existing IDs for the fields that have shrunk, (for example from 4 characters to 3), should there be any errors if the field is left as is or would the field be truncated. Or should the field be removed from existing IDs and re-added after the update and IPL.
Release : 16.0
Component : CA ACF2 for z/OS
The process of adjusting the length of fields in the logonid record is
quite complicated and there are rules that need to be followed.
When defining a field it must be remembered that the data will always be at the same offset in the logonid
if you have a 4 byte character field, it will be defined in userlid as
field1 ds cl4
if you only want to use the first 3 bytes of this field it will be redefined in the same location as...
field1 ds cl3
filler1 ds cl1
whatever was in the first 3 bytes will remain in the first 3 bytes.
The 4th byte (filler1) will contain whatever was originally in the 4th byte.
The easiest way to deal with these changes is to redefine the original fields as "filler" fields
and redefine the new fields with their new lengths after all other fields in userlid or userxlid.
Assuming you know what values are supposed to be in the new field.