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//find PO if it exists
            values.purchaseOrderId = params.record.getSublistValue({
                sublistId: 'purchaseorders',
                fieldId: 'id',
                line: 0
            });

the sublist `purchaseorders` is only "created" after saving the VB

I need to capture that in the creation, in a beforeSubmit event

Have you checked the newRecord to see if the sublist is there? (and has values)

the sublist doesn't even exist while creating the VB