Hi all, hope somebody can help me

I'm trying to get some data from a pivot table
When I was using automatic subtotals I was able to use the formula:
=GETPIVOTDATA("assessment2",$B$15,"Trainee",D2,"Pr ocess Skill",C2,"Level",B2)

When I changed to 'min' subtotals I got a #ref error and tried:
=GETPIVOTDATA($B$15,"Trainee[a] 'Test1' Level['2';Min]")
(where 'Test1' is a 'Process Skill')

Is it possible to modify this formula to include cell references (i.e. B2,
C2, and D2 as above)

Thanks