Sends a bet request so as to create a level profit for the individual selection.

This does not take into account bets from other selections to green up/red up the entire market. 

Therefore if you want to green up the whole market you need to use the trigger on all selections with matched bets.

The bet ref column must contain something for the trigger to work.

Usually this would be the last bet ref placed, but if it's empty you can populate it with any text.
The CLOSE bet is placed in a background thread so there could be multiple Excel updates occurring during the process.

While it is processing the bet ref column contains "CLOSING" and when completed it contains "CLOSED". 
If the bet is not matched within one second it is cancelled and a new bet placed calculated at current odds. 
This also applies to partial matched bets where the unmatched portion is cancelled. 
This repeats until fully matched.