Apparently the routine that enters the IDoc does not correctly point to the data table. The error is very likely to be found within your C++ coding. It is nearly impossible for me to tell where the error exactly is without seeing the code. A general hint to everybody: if possible consider using the .NET adapter or the SAP provided DCOM Active/X components (wdtlog.ocx, wdtfunc.ocx, for latest SAPGUI to be found in the SAPGUI directories).
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