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For TreeSPH codes like Fi and Gadget2 angular momentum is not conserved exactly. The reasons for this are that 1) the gravity forces for a Barnes-Hut tree code are not exactly symmetric for particles in different parts of the domain and 2) interactions between particles in different levels of the time step hierarchy are not exactly symmetric. To make sure that the loss of angular moment that we measure is not due to (the lack of) angular momentum conservation, we determined how well angular momentum is conserved in our reference model. In order to do so, we look at the change of total angular momentum, i.e. of all particles that have been in the computational domain over the course of the simulation, between 1500 and 2500 years. The total angular momentum fluctuates around a mean value, without any increasing or decreasing trend with time. To establish a measure of angular momentum conservation, we determined the mean total angular momentum during the last 1000 years of the simulation, which is $1.5\times10^{44}$kgm$^2$s$^{-1}$, while the standard deviation is $1\times10^{40}$kgm$^2$s$^{-1}$. Thus angular momentum is conserved up to about 1 part in $10^4$. We compare this to the angular momentum loss of the disc 