diff --git a/src/iec61850/server/mms_mapping/reporting.c b/src/iec61850/server/mms_mapping/reporting.c
index f5cd070..ce50808 100644
--- a/src/iec61850/server/mms_mapping/reporting.c
+++ b/src/iec61850/server/mms_mapping/reporting.c
@@ -427,7 +427,12 @@ sendReport(ReportControl* self, bool isIntegrity, bool isGI)
 
     /* Increase sequence number */
     self->sqNum++;
-    MmsValue_setUint16(sqNum, self->sqNum);
+
+    /* Unbuffered reporting --> sqNum is 8 bit only!!! */
+    if (self->sqNum == 256)
+        self->sqNum = 0;
+
+    MmsValue_setUint8(sqNum, self->sqNum);
 
     LinkedList_destroyDeep(deletableElements, (LinkedListValueDeleteFunction) MmsValue_delete);
     LinkedList_destroyStatic(reportElements);
@@ -549,7 +554,7 @@ createDataSetReferenceForDefaultDataSet(ReportControlBlock* rcb, ReportControl*
 static MmsValue*
 createOptFlds(ReportControlBlock* reportControlBlock)
 {
-    MmsValue* optFlds = MmsValue_newBitString(10);
+    MmsValue* optFlds = MmsValue_newBitString(-10);
     uint8_t options = reportControlBlock->options;
 
     if (options & RPT_OPT_SEQ_NUM)
@@ -574,7 +579,7 @@ createOptFlds(ReportControlBlock* reportControlBlock)
 
 static MmsValue*
 createTrgOps(ReportControlBlock* reportControlBlock) {
-    MmsValue* trgOps = MmsValue_newBitString(6);
+    MmsValue* trgOps = MmsValue_newBitString(-6);
 
     uint8_t triggerOps = reportControlBlock->trgOps;
 
@@ -752,7 +757,7 @@ createUnbufferedReportControlBlock(ReportControlBlock* reportControlBlock,
     namedVariable = (MmsVariableSpecification*) GLOBAL_CALLOC(1, sizeof(MmsVariableSpecification));
     namedVariable->name = copyString("OptFlds");
     namedVariable->type = MMS_BIT_STRING;
-    namedVariable->typeSpec.bitString = 10;
+    namedVariable->typeSpec.bitString = -10;
     rcb->typeSpec.structure.elements[5] = namedVariable;
     mmsValue->value.structure.components[5] = createOptFlds(reportControlBlock);
 
@@ -767,14 +772,14 @@ createUnbufferedReportControlBlock(ReportControlBlock* reportControlBlock,
     namedVariable = (MmsVariableSpecification*) GLOBAL_CALLOC(1, sizeof(MmsVariableSpecification));
     namedVariable->name = copyString("SqNum");
     namedVariable->type = MMS_UNSIGNED;
-    namedVariable->typeSpec.unsignedInteger = 16;
+    namedVariable->typeSpec.unsignedInteger = 8;
     rcb->typeSpec.structure.elements[7] = namedVariable;
-    mmsValue->value.structure.components[7] = MmsValue_newUnsigned(16);
+    mmsValue->value.structure.components[7] = MmsValue_newUnsigned(8);
 
     namedVariable = (MmsVariableSpecification*) GLOBAL_CALLOC(1, sizeof(MmsVariableSpecification));
     namedVariable->name = copyString("TrgOps");
     namedVariable->type = MMS_BIT_STRING;
-    namedVariable->typeSpec.bitString = 6;
+    namedVariable->typeSpec.bitString = -6;
     rcb->typeSpec.structure.elements[8] = namedVariable;
     mmsValue->value.structure.components[8] = createTrgOps(reportControlBlock);
 
@@ -877,7 +882,7 @@ createBufferedReportControlBlock(ReportControlBlock* reportControlBlock,
     namedVariable = (MmsVariableSpecification*) GLOBAL_CALLOC(1, sizeof(MmsVariableSpecification));
     namedVariable->name = copyString("OptFlds");
     namedVariable->type = MMS_BIT_STRING;
-    namedVariable->typeSpec.bitString = 10;
+    namedVariable->typeSpec.bitString = -10;
     rcb->typeSpec.structure.elements[4] = namedVariable;
     mmsValue->value.structure.components[4] = createOptFlds(reportControlBlock);
 
@@ -899,7 +904,7 @@ createBufferedReportControlBlock(ReportControlBlock* reportControlBlock,
     namedVariable = (MmsVariableSpecification*) GLOBAL_CALLOC(1, sizeof(MmsVariableSpecification));
     namedVariable->name = copyString("TrgOps");
     namedVariable->type = MMS_BIT_STRING;
-    namedVariable->typeSpec.bitString = 6;
+    namedVariable->typeSpec.bitString = -6;
     rcb->typeSpec.structure.elements[7] = namedVariable;
     mmsValue->value.structure.components[7] = createTrgOps(reportControlBlock);
 
diff --git a/src/mms/iso_mms/common/mms_value.c b/src/mms/iso_mms/common/mms_value.c
index cf56ea3..3b2b8a3 100644
--- a/src/mms/iso_mms/common/mms_value.c
+++ b/src/mms/iso_mms/common/mms_value.c
@@ -307,7 +307,7 @@ MmsValue_newBitString(int bitSize)
 	    return NULL;
 
 	self->type = MMS_BIT_STRING;
-	self->value.bitString.size = bitSize;
+	self->value.bitString.size = abs(bitSize);
 	self->value.bitString.buf = (uint8_t*) GLOBAL_CALLOC(bitStringByteSize(self), 1);
 
 	return self;
diff --git a/src/mms/iso_mms/server/mms_get_var_access_service.c b/src/mms/iso_mms/server/mms_get_var_access_service.c
index 9220194..22606c8 100644
--- a/src/mms/iso_mms/server/mms_get_var_access_service.c
+++ b/src/mms/iso_mms/server/mms_get_var_access_service.c
@@ -202,7 +202,7 @@ deleteVariableAccessAttributesResponse(
 	}
 }
 
-static int
+static void
 createVariableAccessAttributesResponse(
 		MmsServerConnection* connection,
 		char* domainId,
@@ -219,7 +219,10 @@ createVariableAccessAttributesResponse(
 
 	    if (domain == NULL) {
 	        if (DEBUG_MMS_SERVER) printf("MMS_SERVER: domain %s not known\n", domainId);
-	        return -1;
+
+	        mmsServer_createConfirmedErrorPdu(invokeId, response,
+	                              MMS_ERROR_ACCESS_OBJECT_NON_EXISTENT);
+	        goto exit_function;
 	    }
 
 	    namedVariable = MmsDomain_getNamedVariable(domain, nameId);
@@ -232,7 +235,11 @@ createVariableAccessAttributesResponse(
 
 	if (namedVariable == NULL) {
 		if (DEBUG_MMS_SERVER) printf("MMS_SERVER: named variable %s not known\n", nameId);
-		return -1;
+
+		mmsServer_createConfirmedErrorPdu(invokeId, response,
+		                          MMS_ERROR_ACCESS_OBJECT_NON_EXISTENT);
+
+		goto exit_function;
 	}
 
 	MmsPdu_t* mmsPdu = mmsServer_createConfirmedResponse(invokeId);
@@ -261,14 +268,15 @@ createVariableAccessAttributesResponse(
         mmsServer_createConfirmedErrorPdu(invokeId, response,
                       MMS_ERROR_SERVICE_OTHER);
 
-        return 0;
+        goto exit_function;
 	}
 
 	deleteVariableAccessAttributesResponse(getVarAccessAttr);
 
 	asn_DEF_MmsPdu.free_struct(&asn_DEF_MmsPdu, mmsPdu, 0);
 
-	return 0;
+exit_function:
+	return;
 }
 
 int