MFPLI10062S The POLY built-in is not supported.

This built-in function is not supported.
Resolution:
If the first argument x has lower bound m and upper bound n and the second argument is y replace with x(m) + x(m+1)*y + x(m+2)*y**2 + ... + x(n)*y**(n-m).
Module:
PLSP2.TB