There are three main reasons for flagging a relative target address: odd boundary (as you noted), too far away, or in a different control section. At the time HLASM added relative-address support, we thought that the frequency of such addressing errors would be very low, so that separate messages wouldn't be necesary.
- Wish list for message ASMA058E McKown, John
- Re: Wish list for message ASMA058E John Ehrman
- Re: Wish list for message ASMA058E Binyamin Dissen
- Re: Wish list for message ASMA058E McKown, John
