'out' flow property (in BDD block) appears in IBD as 'inout'

[avi10000]

Hi,
I have defined a flow property X in a block Blk that I have declared as output.
In the BDD it appears correctly as:
    out X : X_type
But when the block appears (as :Blk) in an IBD it appears as
   inout X : X_type
From the IBD, I go to the Properties window for the flow property X ,and I set the Direction flag to 'out' (in principle, unnecessarily, of course), and click back on the IBD, and save, but the X direction obstinately stays at 'inout'.

Solution?
Thanks.
Avi