(I'm the friend): The problem I'm having with Insert Line is that I get errors when trying to insert a line and add an item to it via setSublistValue (You have entered an Invalid Field Value #### for the following field: item). My thought was that maybe it requires dynamic mode? The item I am trying to add is in fact a real item.

I think you cannot use setSublistValue to add a line, could you show me some of your code?

I used InsertLine to add the line because I'm not in dynamic mode

you're using internal id not item name right?

Hope this helps. Trying to keep it as simple as I can. DSFItem is an Item ID, lineCount is the count of lines before adding a new one, so lineCount should be the line # of the new line.

What script type it is?

User Event. I'm getting the record from the script context

Can this item add in UI?

LOL

Well..Welcome to NetSuite

yep