Solution : https://service.sap.com/sap/support/notes/1448353 (SAP Service marketplace login required)
Key words :
alv grid shows, 'view' toolbar button, relevant support package, blank worksheet reason, signed template sap_sm, 'excel inplace' view, 'excel inplace', blank worksheets, default template, terms reuse_alv_grid_display
Related Notes :
| 1686797 | ALV Excel: Signed SAP standard templates |