Elizabeth,
This sounds like an AS/400 database issue to me, but I freely admit that I don’t have the pleasure of working with AS/400 projects very often.
What happens when you put the call to this service in a REPEAT block and retry it a few times? In order words, if this is a transient error retrying it 2-3 times might allow the call to go through.
Also, if you create a simple java client that uses JDBC to perform the same SQL operation does it encounter the same issue? My guess would be that it would which would lead you to conclude that it is the resource (database) and not the adapter.
HTH,
Mark
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