AmountGroup 

The amount always corresponds to the same price, to express details or
other attached prices, use the Prices sub collection.

Element Group Information

Model

Amount | Amounts
Children: Amount, Amounts

Used By

Element Amounts
Element Group PriceRangeGroup

Source 

<xs:group name="AmountGroup">
  <xs:annotation>
    <xs:documentation>The amount always corresponds to the same price, to express details or other attached prices, use the Prices sub collection.</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:annotation>
      <xs:documentation>One or many</xs:documentation>
    </xs:annotation>
    <xs:element ref="Amount"/>
    <xs:element ref="Amounts"/>
  </xs:choice>
</xs:group>