Please help us to add a new rule to the DocumentApproval BPM approval with the following condition

Could you please help us to add a new rule to the DocumentApproval BPM approval with the following conditions:

Purchase order:

•Supplier = XXXX SUPPLIES PTY LTD

•Only applicable for Change Orders, not new orders.

•It’s only a GST related change in the Tax Classification field.

The approver should go to a static single approver Mr George Martin

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While create PO-Change, if Tax Classification code changes between any of below, notification should triggered to single approver.

There are lookup exist

lookup Description	Meaning
AU GST EXEMPT	AU GST EXEMPT
AU GST STDP	Standard purchases with Australian GST included at 10%
AU GST-FREE