How to Disable the buttons complete and cancel assignment in a component uses salv_wd_table

Dear Gurus,

How to Disable the buttons complete and cancel assignment in a component uses salv_wd_table.

At Portal level for us more field help do not work due to some technical issues, we can use only technical help.

please find the screen shots attached.

1st screen shot i get when i click the work overview, there the buttons are disabled but when i click on the link marked as per the images marked screen shot these complete and cancel assignment buttons which are enabled should be disabled.

its EHS module.

Help is much Appreciated.

Thanks and Regards,

Dilip Kumar