@ IanWaterman
When I try your formula, I get an error:
{near Miss count}:
if {IRSCODE.CODE}in ["NME1", "NME2", "NME3"] then 1 else 0
{precursor count}:
if {IRSCODE.CODE}in ["PSE1", "PSE2", "PSE3", "PSE4"] then 1 else 0
{{precursor count}:}:
if {IRSCODE.CODE}in ["SSE1", "SSE2", "SSE3", "SSE4"...