Message Number list used by SAP ABAP Program MSERPE01 (Events (AT USER-COMMAND, TOP-OF-PAGE, ...))

#	Object Type	Object Name	Object Description

1	Message Number	DS - 304	The cursor is not positioned on a line which can be selected
2	Message Number	DS - 318	Choose a sub-tree
3	Message Number	DS - 320	You can only use this function for ABAP reports and queries with variants
4	Message Number	DS - 321	Choose a list
5	Message Number	DS - 352	Function not supported for this report type
6	Message Number	DS - 355	Place the cursor on a report name
7	Message Number	DS - 375	You can only select report or variant lines
8	Message Number	DS - 376	Place the cursor on the entry before which you want to insert
9	Message Number	DS - 403	No documentation found
10	Message Number	DS - 409	Node cannot be executed in the background