Question: Partial Integration in Maple


u := proc (x, y) options operator, arrow; u[x](x)*(y/delta(x)-2*y^2/delta(x)^2+y^3/delta(x)^3+B*H*(1-3*y^2/delta(x)^2+2*y^3/delta(x)^3)/delta(x))/(3*B*H/delta(x)+2) end proc

int(u(x, y)^2, y = 0 .. delta(x))


I tried the following partial integration in MAPLE. But Maple says:

Error, (in u[x]) too many levels of recursion.
Analytically it is possible to evaluate the integral in the above lomits. Where lies the problem?
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