Do not update LFBW with (wild) Open SQL statements, but use standard tools and the change documents will be created 
- BDC (FK02/XK02)
- Class VMD_EI_API Method MAINTAIN_BAPI or MAINTAIN_DIRECT_INPUT
NB: Do not confuse change document (generated in program, look at transaction SCDO - object KRED) and log of change data (generated by Open SQL statements)
A "bad" solution would be usage of SQL statement and call of FM which write the change document (KRED_WRITE_DOCUMENT) 
Regards,
Raymond