Update BPS Web Interface variable using user-exit

Hello,

I have a variable in a BPS Web interface which I want to update when I press a function button which calls a user exit. The user exit is being called, gets the right value for the variable. After that I'm using API_SEMBPS_VARIABLE_SET to set the variable followed by API_SEMBPS_POST - but the variable value in the web interface is not being updated.

Please help.

Thanks and regards.

Rajendra