diff --git a/src/libslic3r/PerimeterGenerator.cpp b/src/libslic3r/PerimeterGenerator.cpp
index c67f0cf3f3..421cdd48b6 100644
--- a/src/libslic3r/PerimeterGenerator.cpp
+++ b/src/libslic3r/PerimeterGenerator.cpp
@@ -1129,7 +1129,7 @@ void PerimeterGenerator::process_classic()
     coord_t ext_perimeter_spacing   = this->ext_perimeter_flow.scaled_spacing();
     coord_t ext_perimeter_spacing2;
     // Orca: ignore precise_outer_wall if wall_sequence is not InnerOuter
-    if(config->precise_outer_wall)
+    if(config->precise_outer_wall && config->wall_sequence != WallSequence::InnerOuter)
         ext_perimeter_spacing2 = scaled<coord_t>(0.5f * (this->ext_perimeter_flow.width() + this->perimeter_flow.width()));
     else
         ext_perimeter_spacing2 = scaled<coord_t>(0.5f * (this->ext_perimeter_flow.spacing() + this->perimeter_flow.spacing()));
@@ -2124,7 +2124,7 @@ void PerimeterGenerator::process_arachne()
         if (is_topmost_layer && loop_number > 0 && config->only_one_wall_top)
             loop_number = 0;
         
-        auto apply_precise_outer_wall = config->precise_outer_wall;
+        auto apply_precise_outer_wall = config->precise_outer_wall && config->wall_sequence != WallSequence::InnerOuter;
         // Orca: properly adjust offset for the outer wall if precise_outer_wall is enabled.
         ExPolygons last = offset_ex(surface.expolygon.simplify_p(surface_simplify_resolution),
                        apply_precise_outer_wall? -float(ext_perimeter_width - ext_perimeter_spacing )
diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index e76b95eca1..9f6e8f6a8b 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -1600,6 +1600,12 @@ StringObjectException Print::validate(StringObjectException *warning, Polygons*
             //    }
             // }
 
+            // check wall sequence and precise outer wall
+            if (m_default_region_config.precise_outer_wall && m_default_region_config.wall_sequence != WallSequence::InnerOuter) {
+                warning->string  = L("Precise outer wall will be ignored when wall sequence is InnerOuter.");
+                warning->opt_key = "precise_outer_wall";
+            }
+
         } catch (std::exception& e) {
             BOOST_LOG_TRIVIAL(warning) << "Orca: validate motion ability failed: " << e.what() << std::endl;
         }
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 2d491a2f92..e8d954ff99 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -1085,7 +1085,7 @@ void PrintConfigDef::init_fff_params()
     def = this->add("precise_outer_wall",coBool);
     def->label = L("Precise wall");
     def->category = L("Quality");
-    def->tooltip  = L("Improve shell precision by adjusting outer wall spacing. This also improves layer consistency.");
+    def->tooltip  = L("Improve shell precision by adjusting outer wall spacing. This also improves layer consistency. NOTE: This option will be ignored unless the wall sequence is InnerOuter.");
     def->set_default_value(new ConfigOptionBool{true});
     
     def = this->add("only_one_wall_top", coBool);
diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index 1c0e8b95cc..c76e1e2520 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -1145,7 +1145,6 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "overhang_reverse_internal_only"
             || opt_key == "overhang_reverse_threshold"
             || opt_key == "wall_direction"
-            //BBS
             || opt_key == "enable_overhang_speed"
             || opt_key == "detect_thin_wall"
             || opt_key == "precise_outer_wall") {