Customize Purchase approval task to get overriding Approver user Name

Summary:

We are trying to customize the DocumentApproval task in order to skip the buyer approval if:

• the PO was processed from a requisition
• the requisition has an overriding approver
• the PO buyer is the same as the requisition overriding approver

The problem is that we are able to get from the task attributes only the id of the requisition overriding approver

<ns1:RequisitionAmount>

<ns1:PoLineId><some po line id></ns1:PoLineId>
<ns1:OverridingApproverId><come user id></ns1:OverridingApproverId>
<ns1:UserAttributesCalculatedFlag xsi:nil="true"/>

</ns1:RequisitionAmount>

whereas for the buyer we are getting the user name and not the ID