You changed/re-configured transport route, after that, you found "Target System" of some un-released transport requests became blank.
Also in transport route change log (Transport route screen -> Utilities -> display log -> Request Adjustments), you can see the following message:
Target of request XXX was changed from AAA to (blank).
Normally the message should be like:
Target of request XXX was changed from AAA to BBB.
target system, target group, STMS, transport route, transport layer, target , KBA , BC-CTS-TMS , Transport Management System , Problem
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