diff a/src/order_cmd.cpp b/src/order_cmd.cpp
--- src/order_cmd.cpp
+++ src/order_cmd.cpp
@@ -1310,7 +1310,7 @@
 	Order *order = v->GetOrder(sel_ord);
 	switch (order->GetType()) {
 		case OT_GOTO_STATION:
-			if (mof == MOF_COND_VARIABLE || mof == MOF_COND_COMPARATOR || mof == MOF_DEPOT_ACTION || mof == MOF_COND_VALUE) return CMD_ERROR;
+			if (mof == MOF_COND_VARIABLE || mof == MOF_COND_COMPARATOR || mof == MOF_DEPOT_ACTION || mof == MOF_COND_VALUE || mof == MOF_COND_DESTINATION) return CMD_ERROR;
 			break;
 
 		case OT_GOTO_DEPOT:
@@ -1381,6 +1381,7 @@
 		case MOF_COND_VALUE:
 			switch (order->GetConditionVariable()) {
 				case OCV_UNCONDITIONALLY: return CMD_ERROR;
+				case OCV_REQUIRES_SERVICE: return CMD_ERROR;
 
 				case OCV_LOAD_PERCENTAGE:
 				case OCV_RELIABILITY:
@@ -1455,6 +1456,7 @@
 
 					case OCV_REQUIRES_SERVICE:
 						if (occ != OCC_IS_TRUE && occ != OCC_IS_FALSE) order->SetConditionComparator(OCC_IS_TRUE);
+						order->SetConditionValue(0);
 						break;
 
 					case OCV_LOAD_PERCENTAGE: