diff --git a/src/cl_ctmenu.clas.abap b/src/cl_ctmenu.clas.abap
index 962e87d..9d145f3 100644
--- a/src/cl_ctmenu.clas.abap
+++ b/src/cl_ctmenu.clas.abap
@@ -6,8 +6,8 @@ CLASS cl_ctmenu DEFINITION PUBLIC.
 
     METHODS add_function
       IMPORTING
-        fcode TYPE string
-        text  TYPE string.
+        fcode TYPE ui_func
+        text  TYPE gui_text.
 ENDCLASS.
 
 CLASS cl_ctmenu IMPLEMENTATION.
diff --git a/src/ddic/gui_text.dtel.xml b/src/ddic/gui_text.dtel.xml
new file mode 100644
index 0000000..f121129
--- /dev/null
+++ b/src/ddic/gui_text.dtel.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<abapGit version="v1.0.0" serializer="LCL_OBJECT_DTEL" serializer_version="v1.0.0">
+ <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
+  <asx:values>
+   <DD04V>
+    <ROLLNAME>GUI_TEXT</ROLLNAME>
+    <DDLANGUAGE>E</DDLANGUAGE>
+    <HEADLEN>55</HEADLEN>
+    <SCRLEN1>10</SCRLEN1>
+    <SCRLEN2>20</SCRLEN2>
+    <SCRLEN3>40</SCRLEN3>
+    <DDTEXT>GUI_TEXT</DDTEXT>
+    <REPTEXT>GUI_TEXT</REPTEXT>
+    <SCRTEXT_S>GUI_TEXT</SCRTEXT_S>
+    <SCRTEXT_M>GUI_TEXT</SCRTEXT_M>
+    <SCRTEXT_L>GUI_TEXT</SCRTEXT_L>
+    <DTELMASTER>E</DTELMASTER>
+    <DATATYPE>CHAR</DATATYPE>
+    <LENG>000040</LENG>
+    <OUTPUTLEN>000040</OUTPUTLEN>
+   </DD04V>
+  </asx:values>
+ </asx:abap>
+</abapGit>