I have a user defined form with two matrix items.. Each matrix item is attached to datatable .. No business objects involved .. Form pages thru BusinessPartner data by means of my own code without any problems , also user can update BP data via my own code without any problem .. Now when i hit add button I empty matrix items and fill with blanks , form automatically switches to add mode BUT i can't key data into my matrix items .. They are attached to data sources and after add button pressed and before screen is displayed I load matrix via LoadFromDataSource .. But I cannot key data into matrix !! .. Anyone any idea ?