There is a case that Error "Choose an existing request" occur when push Settings button on Fiori Launchpad Designer (FLPD).
Fiori Launchpad Designer
TK/773 , /IWBEP/CX_MGW_BUSI_EXCEPTION , Workbench Request , Customize Request , transport , KBA , CA-FE-FLP-DT , Designer (ABAP) , Problem
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