refactored

Author: AnnaAPak

app/code/Magento/Sales/Test/Mftf/Test/AdminCreateInvoiceTest.xml

@@ -18,7 +18,7 @@
             <testCaseId value="MAGETWO-72096"/>
             <group value="sales"/>
             <skip>
-             <issueID value="DEPRECATED">Use AdminInvoiceOrderTest instead</issueID>
+             <issueId value="DEPRECATED">Use AdminInvoiceOrderTest instead</issueId>
             </skip> 
         </annotations>
         <before>

app/code/Magento/Sales/Test/Mftf/Test/AdminInvoiceOrderTest.xml

@@ -46,7 +46,7 @@
         <actionGroup ref="AdminLoginActionGroup" stepKey="loginAsAdmin1"/>
 
         <actionGroup ref="AdminOpenOrderByEntityIdActionGroup" stepKey="openOrder">
-            <argument name="entity_id" value="$createGuestCart.return$"/>
+            <argument name="entityId" value="$createGuestCart.return$"/>
         </actionGroup>    
 
         <actionGroup ref="AdminCreateInvoiceActionGroup" stepKey="createInvoice"/>