MCH3601 Error in QRNXDBIO

Running out of ideas here.

Under V3R1, an RPGLE program is getting an MCH3601 error at statement 41
of procedure _QRNX_DB_READ of QRNXDBIO.

The program reads transaction FILEA and determines if FILEB needs to be
updated.  
        If FILEB is not updated, the next READ to FILEA has no problem.
        If FILEB is updated, the next READ to FILEA has the run-time
error above followed by a CPI93CA.

The program is created from a single module with the default activation
group (also tried it with ACTGRP(*NEW).
FILEA and FILEB are single member physical files with no overrides.
The READ statement had both EOF and ERR indicators (removed the ERR
indicator, same error)
When coded in RPG/400 there are no errors.
I checked the technical database and APAR SA71024 is the closest match I
found, but there are no overlays in the code.

Has anyone else ever seen this? 
Have any ideas on what might be a cause?

John Compton <john.compton@heiligmeyers.com>
IBM Certified Specialist - RPG
The opinions expressed by me are not necessarily those of my employer.


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