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I'm loading an item fulfilment using record.load and I can see (in the debugger) that there is no linked inventory detail record on any line items. I can see the inventory detail record against each line item in the UI though - anyone seen something similar?

have you tried using getSublistSubrecord. There is no requirement that the inventory detail has to be on the record's toJSON object

though to be honest, you shouldn't have issues with errors about the inventory detail not being set unless you are editing the items sublist