Not a Problem
Line 7 userfunction SPvt(A,1) embedded in userfunction T(1, SPvt(A, 1)) does not return correct value (Line 5,6)
Line 9 userfunction SPvt(A,1) packed in an if() clause return correct
Files:
userfunctionCal...
The same problem 
That syntax doesn't work in the CAS View, it's Algebra View only. You can check with
If-Clause return correct matrix T(1,3) exchange row 1<->3! (see line 6 and 9)
>{{0, 0, 1}, {0, 1, 0}, {1, 0, 0}}
the nested userfunction call does not work!
SPvt(A, 1) = 3 should be the correkt return value (see line 5), but
T(1, SPvt(A, 1))
> {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}}
Identity matrix is wrong - should be matrix T(1,3) exchange row 1<->3 seems as return of SPvt(A, 1) = 1
If you change
A:={{4,6,-2},{7,3,8},{-6,-1,5}}
(5) SPvt(A, 1)=2
then Lines 6 and 8 responding and return a matrix exchange 1<->2
but line 7 (T(1, SPvt(A, 1))) does not respond and return still identity matrix
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