The ChangeMan ZMF 8.3 Migration Guide mandates rebuild (i.e. re-assembly and re-link/re-bind) of all assembler exits (i.e. CMNEXnnn modules) in the section named 'Customize Other Version 8.3 Components'. Changes in ZMF 8.3 make this especially important when upgrading to this specific release.

Full article: https://portal.microfocus.com/s/article/KM000015628