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I see that error very often when people try to loop forward through the lines and remove some or all of them; you inevitably go past the sublist length

Slight tangent. I assume the line id is always maintained though?

You remove lines using their index, and as you remove lines, all the indices collapse immediately to remain contiguous. Not sure which `line id` you mean in this context.

I believe this field is always maintained - I can see orders with 4 items in the item list with one item having a 'line' 8

the index is a 'point in time' in your code, the .length of a list will need recalculating every time you remove or add an item (depends exactly what you're doing).