Input inhibit following error message

Hi all,
After having successfully set up destructive backspace, colors and keyboard
mappings (see a previous post) for our linux based thin clients running
xt5250 0.16.5 we suddenly ran into a show stopper...
On a Windows PC running Client Access 5.1 the sequence of events is as
follows:
The user attempts to retrieve a record which is locked by another user. An
error message is issued and is displayed according to the setting in CA. CA
immediately goes into 'keyboard locked/input inhibited (X II)'. Following
'keyboard unlock' the error message is cleared and the screen refreshes.
In xt5250 what happens is the following:
The user attempts to retrieve a record which is locked by another user. An
error message flashes by, to be seen only by the hawk-eyed, and the screen
refreshes after which the input inhibit indicator goes on and the keyboard
is locked. The user wonders why he can't get att his record and frustration
ensues.

I have made a trace file which is 500kB large just to get in, trigger the
error and get out again. It is about 20 years since I last analyzed a block
mode data transfer protocol (3270 BSC)so I'm a little rusty:-). Having no
access to (or for that matter time to delve into) the protocol definition I
will have to go on what I can see.
In the trace file I can see the blocks of data arriving without any
intervening user interaction
1 - The error message
2 - The error message clearing command
3 - The refresh screen
I assume from the behavior in CA that the II command is set somewhere in the
error message block. What I don't understand just now is the rationale
behind deferring the Input Inhibit in xt5250. Please enlighten me:-)
Any help would be appreciated. The alternative is to switch the users over
to a Windows Terminal Services based CA solution but that is possibly 'out
of the frying pan, into the fire' for several reasons.

Please let me know if anybody wants the trace file.

Best regards
Erik Zetterberg erik_zetterberg using the services of hotmail.com (put them
together yourself)