CQS migration considerations

Migrate CQS and any CQS clients on the z/OS® image at the same time. If doing so is not possible, CQS must be migrated before any of the CQS clients are migrated.

Any customer- or vendor-written CQS client that processes CQS return, reason, or completion codes should be evaluated to see if it should be updated for the new codes.

See Common Queue Server coexistence considerations for information about CQS coexistence rules.