diff --git a/app/src/androidTest/java/com/utsmm/kbz/ExampleInstrumentedTest.java b/app/src/androidTest/java/com/utsmm/kbz/ExampleInstrumentedTest.java
index 61fbc0b..4080162 100644
--- a/app/src/androidTest/java/com/utsmm/kbz/ExampleInstrumentedTest.java
+++ b/app/src/androidTest/java/com/utsmm/kbz/ExampleInstrumentedTest.java
@@ -88,6 +88,7 @@ public class ExampleInstrumentedTest {
 
         PayDetail payDetail = tradeData.getPayDetail();
 
+        payDetail.setProcessCode("000000");
         payDetail.setTransactionType(TransactionType.SALE);
         String bitmap = BitmapConfig.BPC_SALE;
         MessageType messageType = MessageType.FINANCIAL;
diff --git a/paylibs/src/main/java/com/utsmyanmar/paylibs/isobuilder/EncodePackage.java b/paylibs/src/main/java/com/utsmyanmar/paylibs/isobuilder/EncodePackage.java
index e96e804..3868546 100644
--- a/paylibs/src/main/java/com/utsmyanmar/paylibs/isobuilder/EncodePackage.java
+++ b/paylibs/src/main/java/com/utsmyanmar/paylibs/isobuilder/EncodePackage.java
@@ -234,15 +234,18 @@ public class EncodePackage {
                 int dataType = msgField.getDataType();
                 if (dataType == FieldConfig.SDK_8583_DATA_BIT) {
                     byte[] varValue;
+                    int varValueLen;
                     if(entry.getKey().equals("F055")) {
                         varValue = Utils.StrToBCDBytes(String.format("%0" + msgField.getLengthType() + "d", msgField.getDataLength() / 2));
+                        varValueLen = varValue.length + 1 ;
                     } else {
                         varValue = (String.format("%0" + msgField.getLengthType() + "d", msgField.getDataLength()/2)).getBytes();
+                        varValueLen = varValue.length;
                     }
 
 //
                     System.arraycopy(varValue, 0, body, index, varValue.length);
-                    index += varValue.length;
+                    index += varValueLen;
                 } else if (dataType == FieldConfig.SDK_8583_DATA_BCD) {
                     byte[] varValue;