Why does RandomFunction return variable number of data points?

Question

I am using the following code snippet to generate Compound Poisson process random numbers:

P = CompoundPoissonProcess[1, NormalDistribution[0, 1]];
dataP = RandomFunction[P, {1, 10}]

I am using Mathematica 10 and on different runs of the code I get variously 10 points or 9 points or 13 points...

Is this normal?

How can I force Mathematica to get $n$ data points...

Answer 1

Use an explicit time step in RandomFunction to get 10 points in resulting TemporalData:

P = CompoundPoissonProcess[1, NormalDistribution[0, 1]];
dataP = RandomFunction[P, {1, 10, 1}]