SAP ABAP Message Number TK - 121 (TK) is used by

• Function Module (2)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	Function Module	TR_APPEND_TO_COMM	TR_APPEND_TO_COMM	SCTS_OBJ	BASIS	SAP_BASIS
2	Function Module	TR_APPEND_TO_COMM_OBJS_KEYS	Append and lock objects and keys to a task	SCTS_REQ	BASIS	SAP_BASIS