Can't use filter when accessing hana table through link from another table in sapui5

Question

Hi all,
Have a strange one and I was wondering if someone had come across this before.
Hana table structure
      entity SalesOrder {
    key element name : String;
    element contact : Association[0..*] to Contact via backlink order;
entity Contact {
element location: Location;
    element order : Association to SalesOrder;
==
each sales order has a number of contacts.
In javascript, if I bind on list of contacts directly then I can use the filter
oRowRepeater.bindRows("/Contact",oRowTemplate,null,[new sap.ui.model.Filter("location",sap.ui.model.FilterOperator.EQ, "Germany")]);
and if I enter link i returns the number of entries
Contact/$count?$filter=location eq 'Germany'
But if I get contacts through the sales order it doesn't allow me to use the filter,
oRowRepeater.bindRows("/SalesOrder('mike')/Contact",oRowTemplate,null,[new sap.ui.model.Filter("location",sap.ui.model.FilterOperator.EQ, "Germany")]);
I can return the contacts same as accessing them directly and i can get the information such as
new sap.ui.commons.TextView({text: "{location}"}) same as before but only difference is that i can't filter.
When I try the following I get error
/SalesOrder('mike')/Contact/$count?$filter=location eq 'Germany'
Error
"message": {
            "lang": "en-US",
            "value": {
                "type": "ODataInputError",
                "message": "Bad Request URL: U"
When I open Chrome Developer Tools I see the following error
SalesOrder/contact/$count?$filter=location%20eq%20%27EMEA%27 400 (Bad Request)
Basically the $count doesn't work if you access contacts indirectly even though the link is there.
Is this a bug or am I doing something wrong?
Hana is sp8, I am up to date with almost everything.
Many thanks,
Matthew

Answer 1

for the reading/writing from oracle to access, you could do something like this:
for table in oracle/access with fields of id(number), name(varchar/text):
Connection oconn = //connect to Oracle
Connection aconn =  //connect to access
//create the insert statement into access table
PreparedStatement apstmt = aconn.prepareStatement("INSERT INTO accesstable (id, name) values (?,?)");
//select all the results neeed from oracle table
Statement ostmt = oconn.createStatement();
ResultSet rs = ostmt.executeQuery("select id, name from oracletable where...");
while ( rs.next() )
     apstmt.setLong(1, rs.getLong(1));
     apstmt.setString(2, rs.getString(2));
     apstmt.addBatch();
     //if your driver doesn't support batching, just use this:
     //apstmt.executeUpdate();
//use this only if you use batch statements
apstmt.executeBatch();
rs.close();
stmt.close();
apstmt.close();
oconn.close();
aconn.close();