DFF in PO header level to get the aggregated unit weight of all items in all lines in the PO

Summary:

Is it possible to create a DFF in PO header level to get the aggregated unit weight of all items in all lines in the PO. The DFF must be dynamic and the values must get updated as in when a Line is closed/ created/ updated. We have a requirement in the project to see the aggregated weight when the PO is created in order to assign the truckload accordingly

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