Tekla Structures Learning 21.1 SR2 has been released. The Service Release fixes the error created when IFC & DWG models saved in Tekla Structures Learning version 21.1 or earlier are opened in Tekla Structures Learning 21.1 SR1. The problem appeared as duplicates in reference model list. If there are thousands of objects, opening the reference model list may take a very long time. This Service Release fixes this problem.