diff --git a/OneM2M_Testcases_CSE_Release_1.ttcn b/OneM2M_Testcases_CSE_Release_1.ttcn
index 764d21e8bb147fcefb9671d5f0fd7260edfafad7..3518ff29bd61f895d875b8b7783dceac2360d5a7 100644
--- a/OneM2M_Testcases_CSE_Release_1.ttcn
+++ b/OneM2M_Testcases_CSE_Release_1.ttcn
@@ -3219,6 +3219,73 @@ module OneM2M_Testcases_CSE_Release_1 {
 
 				}//end TC_CSE_REG_DEL_004	
 							
+				/**
+				 * @desc Check that the IUT accepts an AE de-registration when AE-ID is starting with “S”
+				 * 
+				 */
+				testcase TC_CSE_REG_DEL_005() runs on Tester system CseSystem {
+					
+					var AeSimu v_ae1 := AeSimu.create("AE1") alive;
+						v_ae1.start(f_setProtocolBinding(PX_PROTOCOL_BINDING_AE1));
+						v_ae1.done;
+										
+					v_ae1.start(f_CSE_REG_DEL_005());
+							  	  	
+					v_ae1.done;
+							  	  		
+				}
+								
+				function f_CSE_REG_DEL_005() runs on AeSimu {
+					//Local variables
+					var RequestPrimitive v_request;
+					var integer v_aeIndex := -1;	
+
+					//Test control
+					if(not(PICS_IN_CSE)) {
+						setverdict(inconc, __SCOPE__ & ": IUT shall be IN-CSE to run this test case");
+						stop;
+					}
+					
+					// Test component configuration
+					f_cf01Up();
+
+					// Test adapter configuration
+
+					// Preamble
+					v_aeIndex := f_cse_createResource(int2, m_createAe(PX_APP_ID, omit, "S"));//c_CRUDNDi);
+
+					// Test Body
+					v_request := valueof(m_delete(f_getResourceAddress(v_aeIndex), f_getOriginator(v_aeIndex)));
+
+					mcaPort.send(f_getMsgOutPrimitive(m_request(v_request)));
+					tc_ac.start;
+					alt {
+						[] mcaPort.receive(mw_response(mw_responsePrimitive(int2002))) {
+							tc_ac.stop;
+							setverdict(pass, __SCOPE__ & ": AE has been de-registered successfully");
+							f_removeElementFromList(vc_resourcesIndexToBeDeleted, v_aeIndex);
+						}
+						[] mcaPort.receive(mw_response(mw_responsePrimitiveOK)) {
+							tc_ac.stop;
+							setverdict(fail, __SCOPE__ & ": Wrong response status code in the response");
+						}
+						[] mcaPort.receive(mw_response(mw_responsePrimitiveKO)) {
+							tc_ac.stop;
+							setverdict(fail, __SCOPE__ & ": Error while de-registering AE");
+						}
+						[] tc_ac.timeout {
+							setverdict(fail, __SCOPE__ & ": No answer while de-registering AE");
+						}
+					}					    
+
+					// Postamble
+					f_cse_postamble_deleteResources();
+
+					// Tear down
+					f_cf01Down();
+
+				}//end TC_CSE_REG_DEL_005
+				
 			}// end group Delete
 	  	  	
 		}//end Registration