Is there a way to cancel the Approval Notification of Change Orders according to a specific rule?

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Hello guys!

We have a requirement from our customer that when a Purchase Order is created automatically from a Purchase Requisition, the 'Bill To' location must be the same as 'Ship To' location. 

In order to achieve that, developed an integration on ICS that is triggered when a PO is created and we verify whether this PO is automatically created or not and then we call the changeOrder SOAP API to pass the 'Ship To' location equals to 'Bill To'. This integration also triggers the creation of a Change Order and we have an approval rule to automatically approve it (We also send a piece of information on flexfield ATTRIBUTE20 in order to identify that this change order comes from the ICS integration).