Some flow probes values can not be printed

I have a mixed signal design in which I want to probe the current of several supply/gnd connections within the toplevel design.

I encounter the problem that from a number of submodules I cannot print the value of a flow probe in the simvision window when I am interactively debugging the testcase.

However the currents are visible in the wave window so these are probed and flow values can be observed.

Sofar I used the the following commands:

# Check if the node exists:

puts  [value $top.$dut.abln_common_npor4v_uvvcc4v62_1.DVCC]
4.95598

# set the flow probe for the node:

probe -create -flow $top.$dut.abln_common_npor4v_uvvcc4v62_1.DVCC

run 1 us

# Print the flow probe value

puts  [value -flow $top.$dut.abln_common_npor4v_uvvcc4v62_1.DVCC]

ncsim: *W,NOFLPR: A flow probe must exist to access the flow value.
ncsim: *W,OBANOVL: The object $top.$dut.abln_common_npor4v_uvvcc4v62_1.DVCC does not exist, so its value appears as an asterisk.

Both warnings are not correct because the node as well as the flobe probe does exist

Some pins of the block can be probed & logged but some not and it is not a problem if the port is of the inout type because some ports of this type can be printed and some not

Any idea what the cause could be?