Simulink: Error in port width dimensions

Good Morning,

I have a problem with port width dimensions in Simulink (error message in picture 1). I have a 1x1200 vector as input and looking on the upper system level as well 1200 outputs as required (picture 3). Looking into the subsystem I have somehow an (?) instead of the 1200 elements as can be seen on the input. Anyone an idea what's going wrong here?

Picture 1:

Picture 2:

Picture 3: