Allow multiple tradeItem definitions in XML
The GridTradeItems schema should accept multiple product definitions.
To do this we have to set the maxOccurs attribute to "unbounded".
<xsd:complexType name="gridTradeItems">
<xsd:sequence>
- <xsd:element name="tradeItem" type="ti:TradeItemType" minOccurs="1"/>
+ <xsd:element name="tradeItem" type="ti:TradeItemType" minOccurs="1" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
