Using the MultiHeader feature within a TreeTable inside a SmartTable, the lines of the header columns are not summarized in this constellation.
The result is analogous to the example that appears "2018" only once.
SAPUI5 Library version 1.44
SAPUI5, Multi header, multiheader, setheaderspan, gettable, xml view, TreeTable, SmartTable, columns , KBA , CA-UI5-TBL , SAP UI5 table, smart table, list and tree controls , Problem
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