Partial differential terms in Monopole source term

Hi,
I am trying to solve an acoustic problem, in which the monopole source term contains the partial differential terms. I tried using d(p,z), but I would like to know if d(p,z) accounts for total differential or partial differential. I am solving for acoustic pressure in a straight duct with mean flow, where mean flow is entered in the comsol in form of a source term. I am using Pressure acoustics Frequency domain. Kindly help me with this.

Thank you,
Gowtham