diff --git a/data/src/main/java/one/nem/lacerta/data/DocumentDebug.java b/data/src/main/java/one/nem/lacerta/data/DocumentDebug.java
new file mode 100644
index 00000000..dc58a668
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/data/DocumentDebug.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.data;
+
+public interface DocumentDebug {
+}
diff --git a/data/src/main/java/one/nem/lacerta/data/impl/DocumentDebugImpl.java b/data/src/main/java/one/nem/lacerta/data/impl/DocumentDebugImpl.java
new file mode 100644
index 00000000..fc57d5fc
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/data/impl/DocumentDebugImpl.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.data.impl;
+
+public class DocumentDebugImpl {
+}
diff --git a/data/src/main/java/one/nem/lacerta/data/module/DocumentDebugModule.java b/data/src/main/java/one/nem/lacerta/data/module/DocumentDebugModule.java
new file mode 100644
index 00000000..b9e70e7a
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/data/module/DocumentDebugModule.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.data.module;
+
+public class DocumentDebugModule {
+}