diff --git a/src_tenwa/com/tenwa/flow/lease/check/contract/IsNullCheck.java b/src_tenwa/com/tenwa/flow/lease/check/contract/IsNullCheck.java
new file mode 100644
index 000000000..c87c9bb2d
--- /dev/null
+++ b/src_tenwa/com/tenwa/flow/lease/check/contract/IsNullCheck.java
@@ -0,0 +1,32 @@
+package com.tenwa.flow.lease.check.contract;
+
+import jbo.app.tenwa.calc.LC_EBANK;
+
+import com.amarsoft.are.jbo.BizObject;
+import com.amarsoft.are.jbo.JBOException;
+import com.amarsoft.are.jbo.JBOFactory;
+
+public class IsNullCheck {
+	private String EBANK_SN;
+	
+	public String getEBANK_SN() {
+		return EBANK_SN;
+	}
+
+	public void setEBANK_SN(String eBANK_SN) {
+		EBANK_SN = eBANK_SN;
+	}
+
+	public String CustomerIdIsNullCheck() throws JBOException{
+		BizObject bo=JBOFactory.createBizObjectQuery(LC_EBANK.CLASS_NAME, "EBANK_SN='"+EBANK_SN+"'").getSingleResult(false);
+		if(bo!=null&&bo.getAttribute("CUSTOMER_ID")!=null){
+			String customerId = bo.getAttribute("CUSTOMER_ID").toString();
+			if(customerId==null||"".equals(customerId)){
+				return "Y";
+			}else{
+				return "N";
+			}
+		}
+		return "error";
+	}
+}