While developing a specific "form" details for one record in ServiceNow Request App, I found out problem in retrieving some variables.
I found out that the problem is related with the name/path to the field
The field "data_item_field_name" of the table "sys_sg_screen_field", has a max value of 80 chars , and in our case the total path for the field was bigger what made that the field does not appear on the Mobile Details Screen
I have increased the max_length of the field for 255(string) and it worked
