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```var tx = currentRecord.get();	
tx.selectNewLine({sublistId: 'item'});	
tx.setCurrentSublistValue({sublistId: 'item', fieldId: 'item', value: item_id});		
tx.commitLine({sublistId: 'item'});```

I recently had the same issue and some suggested ForceSyncSourcing as suggested already by battk.

```currentRecord.setCurrentSublistValue({
    sublistId: 'item',
    fieldId: 'item',
    value: item,
    forceSyncSourcing: true
});```
