Create multiple external lists with associations in SharePoint 2013, Create Custom Action in ECB (Edit Control Block) in External List in SharePoint 2013

http://code.msdn.microsoft.com/office/SharePoint-2013-Create-2d2ec458
http://msdn.microsoft.com/en-us/library/dn135194.aspx

More about filter Property: FilterField1, FilterType1, FilterValue1, FilterOperator1, Filter1ChainingOperator
http://msdn.microsoft.com/en-us/library/aa981241(v=office.14).aspx 

vs2012->file->new->project c# ->office/SharePoint->apps->apps for SharePoint 2013-> "BCSODataWAssociatedLists"

 
Click on 'Validate' button 

BCSODataWAssociatedLists -> right click -> add -> select 'Content Types for External Data Source..'
-> http://services.odata.org/Northwind/Northwind.svc
-> CannedDataService

Click on 'Next'

Make sure select below check box
Now click on 'Finish'

BCSODataWAssociatedLists -> External Content Types -> CannedDataService -> Exployees.ect -> right click -> open with -> 
 -> Source Code (Text Editor) -> Click on 'Ok'

Go to line number 509 and press enter and copy the below code (or) paste below code after </Methods> tag and before </Entity>
Note: This field 'City' should be exits in two lists Customers & Employees
-----------------------------------------------------------------------------------------------------------
          <Actions>
            <Action Position="1" IsOpenedInNewWindow="false" Url="~site/Lists/Customers/ReadAllCustomer.aspx?FilterField1=City&amp;FilterValue1={0}" Name="Customers for Employee">
              <ActionParameters>
                <ActionParameter Index="0" Name="City"></ActionParameter>
              </ActionParameters>
            </Action>
          </Actions>
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BCSODataWAssociatedLists -> doubel click 'AppManifest.xml'

Change the value of start page: BCSODataWAssociatedLists/Lists/Employees

BCSODataWAssociatedLists -> Deploy

Click on 'Customers for Employee' tab

Thank You