You may saw before the article Create XLSX/MHTML file from internal table in background and you may have use it without any issues before, but it seems that in newer releases of SAP (definitelly ...
... my article Create XLSX/MHTML file from internal table in background and probably also somewhere in the net. To make it easier here are ready methods to create LVC and SLIS field catalogs from ...
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is_layout type lvc_s_layo optional -> alv control: layout structure
i_xlsx type flag optional -> create xlsx file?
Changing:
ct_data type standard table -> our int ...