Set Scalar Parameter in Particle Material

I created a particle system and material for it. The material has a panner, its speed is controlled by a scalar parameter. It works well, but I can’t change the parameter via blueprint. I set up a dynamic material instance in the construction script and I’m using the “Set scalar parameter value” node (the target is dynamic material instance). It doesn’t work, no matter what value I type. When I recreate this type of pannig material on a mesh, it works. Are there any limitations for particle materials I don’t know?