Hello Jon,

Thank you for the additional info.

Based on your messages and the doc at 
https://developers.exlibrisgroup.com/wp-content/uploads/2020/01/3M-Standard-Interchange-Protocol-Version-2.00.pdf,
 the flow goes like something like this (please correct me if I've erred):

1. User scans library card barcode on Bibliotheca self-check
2. User is successfully logged into Bibliotheca self-check
3. User scans item (presumably with RFID as that's what Bibliotheca machines 
use)
4. Bibliotheca machine sends "11" checkout packet to Evergreen 
5. Evergreen does not send a "12" checkout_response packet back; per logging 
shared, Evergreen checks in the patron library card in but doesn't seem to 
receive any item data afterwards.

Does the "11" packet sent by Bibliotheca have the proper item data in it? Is it 
malformed or blank? 

Here is an example below, per the doc:

Checkout
This message is used by the SC to request to check out an item, and also to 
cancel a Checkin request that
did not successfully complete. The ACS must respond to this command with a 
Checkout Response
message.
11<SC renewal policy><no block><transaction date><nb due date><institution 
id><patron
identifier><item identifier><terminal password><patron password><item 
properties><fee
acknowledged><cancel>
Field ID Format
SC renewal policy 1-char, fixed-length required field: Y or N.
no block 1-char, fixed-length required field: Y or N.
transaction date 18-char, fixed-length required field: YYYYMMDDZZZZHHMMSS. The 
date
and time that the patron checked out the item at the SC unit.
nb due date 18-char, fixed-length required field: YYYYMMDDZZZZHHMMSS
institution id AO variable-length required field
patron identifier AA variable-length required field
item identifier AB variable-length required field
terminal password AC variable-length required field
2.00 item properties CH variable-length optional field
2.00 patron password AD variable-length optional field
2.00 fee acknowledged BO 1-char, optional field: Y or N
2.00 cancel BI 1-char, optional field: Y or N
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