diff --git a/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR4.java b/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR4.java
index 0160bcb3..30c235d1 100644
--- a/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR4.java
+++ b/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR4.java
@@ -77,7 +77,11 @@ public String buildVxu(VaccinationReported vaccinationReported, Tenant tenant) {
 						}
 					}
 					if (adminAmount > 0) {
-						sb.append(adminAmount);
+						if (adminAmount == 999.0) {
+							sb.append("999");
+						} else {
+							sb.append(adminAmount);
+						}
 					}
 					// RXA-7
 					sb.append("|");
diff --git a/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR5.java b/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR5.java
index 9b94e747..25c39325 100644
--- a/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR5.java
+++ b/src/main/java/org/immregistries/iis/kernal/logic/ExampleMessageWriterR5.java
@@ -77,7 +77,11 @@ public String buildVxu(VaccinationReported vaccinationReported, Tenant tenant) {
 						}
 					}
 					if (adminAmount > 0) {
-						sb.append(adminAmount);
+						if (adminAmount == 999.0) {
+							sb.append("999");
+						} else {
+							sb.append(adminAmount);
+						}
 					}
 					// RXA-7
 					sb.append("|");
diff --git a/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR4.java b/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR4.java
index b20e00be..6ed180e3 100644
--- a/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR4.java
+++ b/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR4.java
@@ -1113,7 +1113,11 @@ public String buildRSP(HL7Reader reader, String messageRecieved, PatientMaster p
 						}
 					}
 					if (adminAmount > 0) {
-						sb.append(adminAmount);
+						if (adminAmount == 999.0) {
+							sb.append("999");
+						} else {
+							sb.append(adminAmount);
+						}
 					}
 					// RXA-7
 					sb.append("|");
diff --git a/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR5.java b/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR5.java
index 727913ad..aae33c05 100644
--- a/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR5.java
+++ b/src/main/java/org/immregistries/iis/kernal/logic/IncomingMessageHandlerR5.java
@@ -1118,7 +1118,11 @@ public String buildRSP(HL7Reader reader, String messageRecieved, PatientMaster p
 						}
 					}
 					if (adminAmount > 0) {
-						sb.append(adminAmount);
+						if (adminAmount == 999.0) {
+							sb.append("999");
+						} else {
+							sb.append(adminAmount);
+						}
 					}
 					// RXA-7
 					sb.append("|");