I have a session which is a collection of structures

SESSION.squad.achievements[key]

so it may be

SESSION.squad.achievements[2010] = "swam 开发者_JAVA百科the english channel";
SESSION.squad.achievements[2009] = "ran a marathon";
SESSION.squad.achievements[2008] = "cycled Le Tour";

My code deletes the stucture temporarily, but does not delete the session so when I refresh the value still exists

<cfset myYear = #myYear# />
<cfset #StructDelete(SESSION.squad.achievements, myYear)#>

Any ideas how I can delete this value?

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Try using cflock

<cflock timeout="30" throwontimeout="No" type="EXCLUSIVE" scope="SESSION">
    <cfset StructDelete(SESSION.squad.achievements, myYear)>
</cflock>