When you tried to set one Normal Change into status Successfully Tested, you met following error and your transport requests are not released. You are sure your user is authorized to use TRUSTED RFC and trigger release.
Also, checking in DEV system, you found the release of the transport requests was never triggered:
SAP Solution Manager 7.1
SAP Solution Manager 7.2
KBA , SV-SMG-CM , Change Request Management , How To
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