Question: constant under the integral.

I have a problem that I thought could be easy to solve it but I couldn't.  I'm working in wave propagation in random media and I'm trying to create a routine to solve problems using Karal's and Keller's approach, it consists in transform a differential equation (describing the form of a wave) with random coefficients over a parameter into an integro-differential equation over a mean wave (a plane wave solution that produces a dispersion’s relation taking into account the randomness of the media). In the process, I have found integrals over functions in the random parameter, it have the form:

∫f(x)μ(x,α)dα

f(x) is constant in alpha, but maple doesn't extract it from the integrand, why do this happen? The integrand comes from a procedure that I defined before with 'proc'.

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