I have tested using url '/sap/opu/odata/SAP/ZGW_QUOTATIONS_EXT_SRV_01/QuotationHeaderSet('10000001')/QuotationFulltoItems' in gwclient
I get details correctly for both line items 10 and 20.
<?xml version="1.0"?>
-<feed xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom" xml:base="http://ua00sapecs01.dctest.inc:8040/sap/opu/odata/SAP/ZGW_QUOTATIONS_EXT_SRV_01/">
<title type="text">QuotationFullItemsSet</title>
<updated>2015-12-23T18:22:19Z</updated>
-<author>
<name/>
</author>
<link title="QuotationFullItemsSet" rel="self" href="QuotationHeaderSet('10000001')/QuotationFulltoItems"/>
-<entry>
<title type="text">QuotationFullItemsSet('10000001')</title>
<updated>2015-12-23T18:22:19Z</updated>
<category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="ZGW_QUOTATIONS_EXT_SRV_01.QuotationFullItems"/>
<link title="QuotationFullItems" rel="self" href="QuotationFullItemsSet('10000001')"/>
-<content type="application/xml">
-<m:properties xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<d:Vbeln>10000001</d:Vbeln>
<d:Posnr>000010</d:Posnr>
<d:Matnr>DOWNPAYMENT</d:Matnr>
<d:Arktx>DOWNPAYMENT</d:Arktx>
<d:Werks>0209</d:Werks>
<d:Orderqty>0.000</d:Orderqty>
<d:Orderuom>EA</d:Orderuom>
<d:Netwr>0.000</d:Netwr>
<d:Waerk>USD</d:Waerk>
<d:Lfgsk/>
<d:Labst>0.000</d:Labst>
<d:Umlme>0.000</d:Umlme>
<d:Onorder>0.000</d:Onorder>
</m:properties>
</content>
</entry>
-<entry>
<title type="text">QuotationFullItemsSet('10000001')</title>
<updated>2015-12-23T18:22:19Z</updated>
<category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="ZGW_QUOTATIONS_EXT_SRV_01.QuotationFullItems"/>
<link title="QuotationFullItems" rel="self" href="QuotationFullItemsSet('10000001')"/>
-<content type="application/xml">
-<m:properties xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<d:Vbeln>10000001</d:Vbeln>
<d:Posnr>000020</d:Posnr>
<d:Matnr>30337</d:Matnr>
<d:Arktx>OLAY 3/23.6 OZ U MOIST BDYWSH</d:Arktx>
<d:Werks>0209</d:Werks>
<d:Orderqty>0.000</d:Orderqty>
<d:Orderuom>EA</d:Orderuom>
<d:Netwr>25680.000</d:Netwr>
<d:Waerk>USD</d:Waerk>
<d:Lfgsk/>
<d:Labst>1192.000</d:Labst>
<d:Umlme>0.000</d:Umlme>
<d:Onorder>0.000</d:Onorder>
</m:properties>
</content>
</entry>
</feed>