Well, I've got a smoking gun.
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3
.ieam900/iea3m9_IGW_messages.htm says of messages such as IGW01557W:

For messages with the prefix IGW01, the type codes indicate the severity of
the detected error and are:
E
Error: Return code 8
I
Information: Return code 0
S
Severe: Return code 16
T
Ending: Return code 12
W
Attention: Return code 4

Would someone who is able to do so be willing to PMR this? We're Dallas
customers and thus red-headed stepchildren when it comes to IBM support.

Charles


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
Behalf Of Peter Relson
Sent: Saturday, March 7, 2020 5:46 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Two related alias entry address questions

>did you have an ENTRY BAR statement in the assembly? 
I did not. I used the form you and Gil showed of "BAR" on the "END" with 
no entry statement (either in the assembly or the bind).

<snip>
Grrr...  But I've even complained of seeing a "I" suffix on messages
reporting JCL errors fatal from the programmer's point of view.  The
rationale is that it's "Informative" from the operator's point of view.
</snip>
Perhaps you have forgotten what message suffixes mean for messages that 
are not things such as utility/compilation outputs.
"W" is not warning, it is wait state. "E" is not error, it is eventual 
action. "I" is often the only viable choice. In general if the message is 
documented in "system messages", this applies (I wouldn't bet that there 
are no exceptions).
I don't argue that that was a good decision, but it has "always" been so 
and will not change.

For IEBCOPY, its "W" would indeed be "warning". I'm with Charles that if 
you get a "W" message I would expect something other than RC=0, likely 
RC=4.
So if the argument is that you asked not to replace, and it did not 
replace, so that's RC=0 I'm OK with that. But then the message for that 
case should be "I" not "W". 

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