Hi Leonid, thanks for your reply. I've now tracked the service call to the last bit, however, I'm still struggling with the following issue:

I've created a custom text field in the timeline post form and I added it to the display 'write profile post', however, the custom field is not processed after filling the form. The database shows the filed on the bx_timeline_events but it is empty. It sounds that the getFormPost() which is used in the Timeline 'write profile post' display does not process the custom field. Could you please help me on this issue!