--- a/src/command.cpp	Tue Jul 10 20:58:07 2007 +0000
+++ b/src/command.cpp	Tue Jul 10 20:59:41 2007 +0000
@@ -429,7 +429,7 @@
 
 /* toplevel network safe docommand function for the current player. must not be called recursively.
  * the callback is called when the command succeeded or failed. */
-bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd)
+bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd, bool my_cmd)
 {
 	CommandCost res, res2;
 	CommandProc *proc;
@@ -455,7 +455,7 @@
 	/** Spectator has no rights except for the (dedicated) server which
 	 * is/can be a spectator but as the server it can do anything */
 	if (_current_player == PLAYER_SPECTATOR && !_network_server) {
-		ShowErrorMessage(_error_message, error_part1, x, y);
+		if (my_cmd) ShowErrorMessage(_error_message, error_part1, x, y);
 		_cmd_text = NULL;
 		return false;
 	}
@@ -572,7 +572,7 @@
 		if (res2.GetCost() != 0) ShowCostOrIncomeAnimation(x, y, GetSlopeZ(x, y), res2.GetCost());
 		if (_additional_cash_required != 0) {
 			SetDParam(0, _additional_cash_required);
-			ShowErrorMessage(STR_0003_NOT_ENOUGH_CASH_REQUIRES, error_part1, x, y);
+			if (my_cmd) ShowErrorMessage(STR_0003_NOT_ENOUGH_CASH_REQUIRES, error_part1, x, y);
 			if (res2.GetCost() == 0) goto callb_err;
 		}
 	}
@@ -585,7 +585,7 @@
 
 show_error:
 	/* show error message if the command fails? */
-	if (IsLocalPlayer() && error_part1 != 0) {
+	if (IsLocalPlayer() && error_part1 != 0 && my_cmd) {
 		ShowErrorMessage(_error_message, error_part1, x, y);
 	}
 

--- a/src/command.h	Tue Jul 10 20:58:07 2007 +0000
+++ b/src/command.h	Tue Jul 10 20:59:41 2007 +0000
@@ -202,7 +202,7 @@
 /* command.cpp */
 typedef void CommandCallback(bool success, TileIndex tile, uint32 p1, uint32 p2);
 CommandCost DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc);
-bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd);
+bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd, bool my_cmd = true);
 
 #ifdef ENABLE_NETWORK
 

--- a/src/network/core/tcp.h	Tue Jul 10 20:58:07 2007 +0000
+++ b/src/network/core/tcp.h	Tue Jul 10 20:59:41 2007 +0000
@@ -68,6 +68,7 @@
 	char text[80];     ///< possible text sent for name changes etc
 	uint32 frame;      ///< the frame in which this packet is executed
 	byte callback;     ///< any callback function executed upon successful completion of the command
+	bool my_cmd;       ///< did the command originate from "me"
 };
 
 /** Status of a client */

--- a/src/network/network_client.cpp	Tue Jul 10 20:58:07 2007 +0000
+++ b/src/network/network_client.cpp	Tue Jul 10 20:59:41 2007 +0000
@@ -628,6 +628,7 @@
 	p->Recv_string(cp->text, sizeof(cp->text));
 	cp->callback = p->Recv_uint8();
 	cp->frame    = p->Recv_uint32();
+	cp->my_cmd   = p->Recv_bool();
 	cp->next     = NULL;
 
 	// The server did send us this command..

--- a/src/network/network_data.cpp	Tue Jul 10 20:58:07 2007 +0000
+++ b/src/network/network_data.cpp	Tue Jul 10 20:59:41 2007 +0000
@@ -62,6 +62,7 @@
 
 		CommandPacket *new_cp = MallocT<CommandPacket>(1);
 		*new_cp = c;
+		new_cp->my_cmd = true;
 		if (_local_command_queue == NULL) {
 			_local_command_queue = new_cp;
 		} else {
@@ -102,7 +103,7 @@
 	debug_dump_commands("ddc:cmd:%d;%d;%d;%d;%d;%d;%d;%s\n", _date, _date_fract, (int)cp->player, cp->tile, cp->p1, cp->p2, cp->cmd, cp->text);
 #endif /* DUMP_COMMANDS */
 
-	DoCommandP(cp->tile, cp->p1, cp->p2, _callback_table[cp->callback], cp->cmd | CMD_NETWORK_COMMAND);
+	DoCommandP(cp->tile, cp->p1, cp->p2, _callback_table[cp->callback], cp->cmd | CMD_NETWORK_COMMAND, cp->my_cmd);
 }
 
 #endif /* ENABLE_NETWORK */

--- a/src/network/network_server.cpp	Tue Jul 10 20:58:07 2007 +0000
+++ b/src/network/network_server.cpp	Tue Jul 10 20:59:41 2007 +0000
@@ -491,6 +491,7 @@
 	p->Send_string(cp->text);
 	p->Send_uint8 (cp->callback);
 	p->Send_uint32(cp->frame);
+	p->Send_bool  (cp->my_cmd);
 
 	cs->Send_Packet(p);
 }
@@ -915,11 +916,13 @@
 			// Callbacks are only send back to the client who sent them in the
 			//  first place. This filters that out.
 			cp->callback = (new_cs != cs) ? 0 : callback;
+			cp->my_cmd = (new_cs == cs);
 			NetworkAddCommandQueue(new_cs, cp);
 		}
 	}
 
 	cp->callback = 0;
+	cp->my_cmd = false;
 	// Queue the command on the server
 	if (_local_command_queue == NULL) {
 		_local_command_queue = cp;