diff --git a/examples/PoolBox/iso/Config.xml b/examples/PoolBox/iso/Config.xml
index 725c3e02..eb57a721 100644
--- a/examples/PoolBox/iso/Config.xml
+++ b/examples/PoolBox/iso/Config.xml
@@ -4,15 +4,14 @@
         <License>%PSX_LICENSE_PATH%/%PSX_LICENSE%.DAT</License>
     </Description>
     <Track lead-out="0:2:0">
-        <!--TODO: JabyEngine should warn at runtime that I did not apply lba_source!-->
         <File    name = "SYSTEM.CNF">System.cnf.subst</File>
-        <Main    name = "%PSX_BOOT_FILE%" lba_source = "../application/src/asset_mgr.cpp">../application/bin/%PSX_TV_FORMAT%/PSX-release/PoolBox.psexe</Main>
-        <Overlay name = "BIO.BIN">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.bios_info</Overlay>
-        <Overlay name = "CTO.BIN" lba_source = "../application/src/Overlay/ControllerTest/controller_test_assets.cpp">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.controller_tests</Overlay>
-        <Overlay name = "GTO.BIN" lba_source = "../application/src/Overlay/GPUTest/gpu_test_assets.cpp">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.gpu_tests</Overlay>
-        <Overlay name = "GTE.BIN" lba_source = "../application/src/Overlay/GTETest/gte_test_assets.cpp">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.gte_tests</Overlay>
-        <Overlay name = "FCO.BIN">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.font_cycler</Overlay>
-        <Overlay name = "SCO.BIN">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.screen_center</Overlay>
+        <Main    name = "%PSX_BOOT_FILE%" lba_source = "../application/src/asset_mgr.cpp"                                    >../application/bin/%PSX_TV_FORMAT%/PSX-release/PoolBox.psexe</Main>
+        <Overlay name = "BIO.BIN"         lba_source = ""                                                                    >../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.bios_info</Overlay>
+        <Overlay name = "CTO.BIN"         lba_source = "../application/src/Overlay/ControllerTest/controller_test_assets.cpp">../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.controller_tests</Overlay>
+        <Overlay name = "GTO.BIN"         lba_source = "../application/src/Overlay/GPUTest/gpu_test_assets.cpp"              >../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.gpu_tests</Overlay>
+        <Overlay name = "GTE.BIN"         lba_source = "../application/src/Overlay/GTETest/gte_test_assets.cpp"              >../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.gte_tests</Overlay>
+        <Overlay name = "FCO.BIN"         lba_source = ""                                                                    >../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.font_cycler</Overlay>
+        <Overlay name = "SCO.BIN"         lba_source = ""                                                                    >../application/bin/%PSX_TV_FORMAT%/PSX-release/Overlay.screen_center</Overlay>
 
         <Directory name = "ASSETS" hidden = "true">
             <Directory name = "MAIN">
diff --git a/src/Tools/psxcdgen_ex/Cargo.toml b/src/Tools/psxcdgen_ex/Cargo.toml
index 1f7d6707..4bd1ed4f 100644
--- a/src/Tools/psxcdgen_ex/Cargo.toml
+++ b/src/Tools/psxcdgen_ex/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "psxcdgen_ex"
-version = "0.6.0"
+version = "1.0.0"
 edition = "2021"
 
 [profile.release]
diff --git a/src/Tools/psxcdgen_ex/src/config_reader/xml.rs b/src/Tools/psxcdgen_ex/src/config_reader/xml.rs
index 7571922b..a8a26ae1 100644
--- a/src/Tools/psxcdgen_ex/src/config_reader/xml.rs
+++ b/src/Tools/psxcdgen_ex/src/config_reader/xml.rs
@@ -1,3 +1,4 @@
+use attribute_names::LBA_SOURCE;
 use cdtypes::types::time::Time;
 use std::path::PathBuf;
 use tool_helper::{format_if_error, path_with_env_from, print_warning, string_with_env_from};
@@ -86,16 +87,26 @@ fn parse_track(track: roxmltree::Node, config: &mut Configuration) -> Result<(),
         }
 
         else {
+            tool_helper::print_warning(format!("The main file should always contain the \"{}\" attribute, even when just empty", LBA_SOURCE));
             parse_regular_file(file, false)
         }
     }
 
     fn parse_overlay_file(file: roxmltree::Node, is_hidden: bool) -> Result<File, Error> {
-        //                                                         v They will be compressed automatically
-        let common = read_common_properties(&file, is_hidden, Some(LZ4State::AlreadyCompressed))?;
-        let path   = path_from_node(&file, &common.name)?;
+        //                                                        v They will be compressed automatically
+        let common     = read_common_properties(&file, is_hidden, Some(LZ4State::AlreadyCompressed))?;
+        let path       = path_from_node(&file, &common.name)?;
+        let lba_source = {
+            if let Some(lba_source) = file.attribute(attribute_names::LBA_SOURCE) {
+                lba_source
+            }
 
-        Ok(File{common, path, kind: FileKind::Overlay(PathBuf::from(file.attribute(attribute_names::LBA_SOURCE).unwrap_or_default()))})
+            else {
+                tool_helper::print_warning(format!("Overlays should always contain the \"{}\" attribute, even when just empty", LBA_SOURCE));
+                ""
+            }
+        };
+        Ok(File{common, path, kind: FileKind::Overlay(PathBuf::from(lba_source))})
     }
 
     fn parse_xa_audio(file: roxmltree::Node, is_hidden: bool) -> Result<File, Error> {