Please clarify. As I'm reading this, you say no observability since
4.5...but from what I'm hearing from IBM, even though observability was
removed in the 5.1-4 range, it was still "there" for upgrade purposes...but
observability 4.5 and before was actual removal...ergo, if the observability
factor was removed 5.1-5.4...there's no issue. Pre-5.1, there's a issue
potential... Is this what you intended to say?
"Thus a program lacks sufficient creation data for conversion only if the program or at least one of its modules was created for OS/400® V4R5 or an earlier release AND creation data was explicitly removed."
This tells me you had to compile back to V4R5 (which you could have done from no later a release than V5R2) and then subsequently remove observability.