<xsd:complexType name="PurchaseOrderHeaderType">
<xsd:complexContent>
<xsd:extension base="OrderHeaderType">
<xsd:sequence>
<xsd:element ref="OrderDateTime" minOccurs="0" />
<xsd:element ref="BuyerParty" minOccurs="0" />
<xsd:element ref="AcceptByDateTime" minOccurs="0" />
<xsd:element ref="ReleaseNumber" minOccurs="0" />
<xsd:element ref="RequisitionReference" minOccurs="0" />
<xsd:element ref="QuoteReference" minOccurs="0" />
<xsd:element ref="UserArea" minOccurs="0" />
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
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