Try this schema:
<xs:schema xmlns:b=”http://schemas.microsoft.com/BizTalk/2003” xmlns:xs=”http://www.w3.org/2001/XMLSchema“>
<xs:annotation>
<xs:appinfo>
<b:schemaInfo standard=”Flat File” root_reference=”Order” default_pad_char=” ” pad_char_type=”char” count_positions_by_byte=”false” parser_optimization=”speed” lookahead_depth=”3″ suppress_empty_nodes=”false” generate_empty_nodes=”true” allow_early_termination=”false” early_terminate_optional_fields=”false” allow_message_breakup_of_infix_root=”false” compile_parse_tables=”false” default_child_order=”infix” child_delimiter_type=”hex” default_child_delimiter=”0x0D 0x0A” />
<schemaEditorExtension:schemaInfo namespaceAlias=”b” extensionClass=”Microsoft.BizTalk.FlatFileExtension.FlatFileExtension” standardName=”Flat File” xmlns:schemaEditorExtension=”http://schemas.microsoft.com/BizTalk/2003/SchemaEditorExtensions” />
</xs:appinfo>
</xs:annotation>
<xs:element name=”Order”>
<xs:annotation>
<xs:appinfo>
<b:recordInfo structure=”delimited” preserve_delimiter_for_empty_data=”true” suppress_trailing_delimiters=”false” sequence_number=”1″ child_order=”postfix” child_delimiter_type=”default” />
</xs:appinfo>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:annotation>
<xs:appinfo>
<b:groupInfo sequence_number=”0″ />
</xs:appinfo>
</xs:annotation>
<xs:element name=”Header”>
<xs:annotation>
<xs:appinfo>
<b:recordInfo sequence_number=”1″ structure=”delimited” preserve_delimiter_for_empty_data=”true” suppress_trailing_delimiters=”false” child_order=”infix” child_delimiter_type=”char” child_delimiter=”|” tag_name=”ORDER” />
</xs:appinfo>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:annotation>
<xs:appinfo>
<b:groupInfo sequence_number=”0″ />
</xs:appinfo>
</xs:annotation>
<xs:element name=”Field” type=”xs:string”>
<xs:annotation>
<xs:appinfo>
<b:fieldInfo sequence_number=”1″ justification=”left” />
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:element name=”Date” type=”xs:date”>
<xs:annotation>
<xs:appinfo>
<b:fieldInfo sequence_number=”2″ justification=”left” datetime_format=”yyyy-MM-dd” />
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name=”Items”>
<xs:annotation>
<xs:appinfo>
<b:recordInfo sequence_number=”2″ structure=”delimited” preserve_delimiter_for_empty_data=”true” suppress_trailing_delimiters=”false” child_order=”infix” child_delimiter_type=”default” />
</xs:appinfo>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:annotation>
<xs:appinfo>
<b:groupInfo sequence_number=”0″ />
</xs:appinfo>
</xs:annotation>
<xs:element maxOccurs=”unbounded” name=”Item”>
<xs:annotation>
<xs:appinfo>
<b:recordInfo sequence_number=”1″ structure=”positional” preserve_delimiter_for_empty_data=”true” suppress_trailing_delimiters=”false” tag_name=”IT” tag_offset=”0″ />
</xs:appinfo>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:annotation>
<xs:appinfo>
<b:groupInfo sequence_number=”0″ />
</xs:appinfo>
</xs:annotation>
<xs:element name=”Code” type=”xs:string”>
<xs:annotation>
<xs:appinfo>
<b:fieldInfo sequence_number=”1″ justification=”left” pos_length=”5″ pos_offset=”2″ />
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:element name=”Description” type=”xs:string”>
<xs:annotation>
<xs:appinfo>
<b:fieldInfo sequence_number=”2″ justification=”left” pos_length=”12″ />
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:element name=”Quantity” type=”xs:string”>
<xs:annotation>
<xs:appinfo>
<b:fieldInfo sequence_number=”3″ justification=”left” pos_length=”1″ />
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>