Invoice approval for invoice with withholding populated at Invoice Line Level

Oracle Payables Fusion

We have a business requirement to send invoice of supplier for which withholding is setup at site level to Tax Team for approval. We are trying to identify the attribute which can be used to configure this scenario in BPM. Currently we have selected attribute “Invoice Distribution. Withholding Tax Group ID”. However if the at invoice line level withholding field is updated , updates are flowing to Invoice distributions and hence current attribute “Invoice Distribution. Withholding Tax Group ID” is not working as expected. Kindly advise the appropriate attribute which can be used for above mentioned business scenario