Modelsim-Altera cannot find instance

New to Quartus I tried a relatively simple design with 3 blocks of VHDL source and a vht testbench. The project can be simulated in the native simulator but when using NativeLink, ModelSim gives the following error:

# ** Error: (vsim-SDF-3250) RWL_tacho_if_vhd.sdo(0): Failed to find INSTANCE '/dut'.

Can anybody help me with this or point to a good hands-on tutorial how to set up NativeLink for a project with hierarchical source files ?

Frans