diff --git a/src/iec61850/client/client_control.c b/src/iec61850/client/client_control.c
index ebe24319..1f64efed 100644
--- a/src/iec61850/client/client_control.c
+++ b/src/iec61850/client/client_control.c
@@ -57,6 +57,7 @@ struct sControlObjectClient
 
     LastApplError lastApplError;
     MmsError lastMmsError;
+    MmsDataAccessError lastAccessError; /* last error of read or write command */
 
     CommandTerminationHandler commandTerminationHandler;
     void* commandTerminaionHandlerParameter;
@@ -316,7 +317,10 @@ ControlObjectClient_getCtlValType(ControlObjectClient self)
 IedClientError
 ControlObjectClient_getLastError(ControlObjectClient self)
 {
-    return iedConnection_mapMmsErrorToIedError(self->lastMmsError);
+    if (self->lastAccessError != DATA_ACCESS_ERROR_SUCCESS)
+        return iedConnection_mapDataAccessErrorToIedError(self->lastAccessError);
+    else
+        return iedConnection_mapMmsErrorToIedError(self->lastMmsError);
 }
 
 void
@@ -501,13 +505,14 @@ ControlObjectClient_operate(ControlObjectClient self, MmsValue* ctlVal, uint64_t
 
     MmsError mmsError;
 
-    MmsConnection_writeVariable(IedConnection_getMmsConnection(self->connection),
+    MmsDataAccessError writeResult = MmsConnection_writeVariable(IedConnection_getMmsConnection(self->connection),
             &mmsError, domainId, itemId, operParameters);
 
     MmsValue_setElement(operParameters, 0, NULL);
     MmsValue_delete(operParameters);
 
     self->lastMmsError = mmsError;
+    self->lastAccessError = writeResult;
 
     if (mmsError != MMS_ERROR_NONE) {
         if (DEBUG_IED_CLIENT)
@@ -544,6 +549,9 @@ internalOperateHandler(uint32_t invokeId, void* parameter, MmsError err, MmsData
 
         bool success = false;
 
+        self->lastMmsError = err;
+        self->lastAccessError = accessError;
+
         if (iedError == IED_ERROR_OK) {
             iedError = iedConnection_mapDataAccessErrorToIedError(accessError);
 
@@ -728,6 +736,7 @@ ControlObjectClient_selectWithValue(ControlObjectClient self, MmsValue* ctlVal)
     MmsValue_delete(selValParameters);
 
     self->lastMmsError = mmsError;
+    self->lastAccessError = writeResult;
 
     if (mmsError != MMS_ERROR_NONE) {
         if (DEBUG_IED_CLIENT)
@@ -765,6 +774,9 @@ internalSelWithValHandler(uint32_t invokeId, void* parameter, MmsError err, MmsD
 
         bool success = false;
 
+        self->lastMmsError = err;
+        self->lastAccessError = accessError;
+
         if (iedError == IED_ERROR_OK) {
             iedError = iedConnection_mapDataAccessErrorToIedError(accessError);
 
@@ -881,6 +893,7 @@ ControlObjectClient_select(ControlObjectClient self)
     self->ctlNum++;
 
     self->lastMmsError = mmsError;
+    self->lastAccessError = DATA_ACCESS_ERROR_SUCCESS;
 
     if (value == NULL) {
         if (DEBUG_IED_CLIENT)
@@ -899,6 +912,12 @@ ControlObjectClient_select(ControlObjectClient self)
             selected = true;
         }
     }
+    else if (MmsValue_getType(value) == MMS_DATA_ACCESS_ERROR) {
+        self->lastAccessError = MmsValue_getDataAccessError(value);
+
+        if (DEBUG_IED_CLIENT)
+            printf("IED_CLIENT: select returned data-access-error: %i\n", self->lastAccessError);
+    }
     else {
         if (DEBUG_IED_CLIENT)
             printf("IED_CLIENT: select: unexpected response from server!\n");
@@ -925,12 +944,17 @@ internalSelectHandler(uint32_t invokeId, void* parameter, MmsError err, MmsValue
 
         bool success = false;
 
+        self->lastMmsError = err;
+        self->lastAccessError = DATA_ACCESS_ERROR_SUCCESS;
+
         self->ctlNum++;
 
         if (iedError == IED_ERROR_OK) {
 
             if (MmsValue_getType(value) == MMS_DATA_ACCESS_ERROR) {
-                iedError = iedConnection_mapDataAccessErrorToIedError(MmsValue_getDataAccessError(value));
+                MmsDataAccessError dataAccessError = MmsValue_getDataAccessError(value);
+                self->lastAccessError = dataAccessError;
+                iedError = iedConnection_mapDataAccessErrorToIedError(dataAccessError);
             }
             else if (MmsValue_getType(value) == MMS_VISIBLE_STRING) {
 
@@ -1082,6 +1106,7 @@ ControlObjectClient_cancel(ControlObjectClient self)
             &mmsError, domainId, itemId, cancelParameters);
 
     self->lastMmsError = mmsError;
+    self->lastAccessError = writeResult;
 
     MmsValue_setElement(cancelParameters, 0, NULL);
     MmsValue_delete(cancelParameters);
@@ -1117,6 +1142,9 @@ internalCancelHandler(uint32_t invokeId, void* parameter, MmsError err, MmsDataA
 
         bool success = false;
 
+        self->lastMmsError = err;
+        self->lastAccessError = accessError;
+
         if (iedError == IED_ERROR_OK) {
             iedError = iedConnection_mapDataAccessErrorToIedError(accessError);