diff --git a/src/libmisdnuser/suppserv/fac.c b/src/libmisdnuser/suppserv/fac.c
index dd55857..43c588a 100644
--- a/src/libmisdnuser/suppserv/fac.c
+++ b/src/libmisdnuser/suppserv/fac.c
@@ -406,7 +406,7 @@ static int encodeAOCDChargingUnitOperation(__u8 * dest, const struct asn1_parm *
 		p[i++] = 0x30;
 		p[i++] = (0x02 + len);
 		p[i++] = 0x02;	// Operation Tag
-		p[i++] = 0x01;	// AOC-D so Sub-Total
+		p[i++] = 0x01;
 
 		// Recorded units could take up as much as 3 bytes (0xFFFFFF)
 		p[i] = numberOfUnits & 0xFF;
@@ -416,9 +416,9 @@ static int encodeAOCDChargingUnitOperation(__u8 * dest, const struct asn1_parm *
 			p[i+2] = (numberOfUnits >> 16) & 0xFF;
 		i += len;
 
-		p[i++] = 0x82;
-		p[i++] = 0x01;
+		p[i++] = 0x82;	// Type of charging info
 		p[i++] = 0x01;
+		p[i++] = 0x00;	// AOC-D so Sub-Total
 
 		p[1] = (AOCD_CHARGE_UNIT_IE_LENGTH + len);	// IE Payload Length
 		p[4] = p[1] - 3;	// Invoke Component Length