Remove the training from IC or ...

Remove the training from IC if the bonus is 10%.
Few times in preparation, I didn't notice, it was mechanical, I pushed the button when my team already had that 10%

or make a note like
Are you sure ?
Your bonus is already 10%. Proceed ?

My players lost condition but as most of them are old, gained almost nothing.

I played tens of games in preparation and won them without pressing the bonus buttons and i lost some games as well when I used the bonus ... strange isnt it

i think bonus in IC is just visual and the assistant manager advices sometimes backfire at you :D