After you have upgraded the frontend, you can't save workbooks anymore.
When you save workbook, error happens:
"You have modified a signed project. You do not have the correct key to sign this project. The signature will be discarded. Do you want to save the changes and discard the signature or cancel the save action?"
save workbook, missing BEx API, signed project, signature , KBA , BW-BEX-ET-WB , Queries in Workbooks , Problem
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