Multi Selection in Web Dynpro ALV

Hi experts,

I have a problem. I have some ALVs in my application.

Every context node has cardinality 0...n and selection 0...n.

Every ALV has the following code:

...

* Selection
lv_conf_abschnitte->if_salv_wd_table_settings~set_selection_mode( cl_wd_table=>e_selection_mode-multi ).

* Enabled
lv_conf_abschnitte->if_salv_wd_table_settings~set_enabled( ABAP_TRUE ).

...

The problem is, multi row selection works for some ALVs and for some it doesn't work!

Do you have any hints ?

Thanks in advance.

Best regards,

hhermann