diff --git a/at/at3100a.uml b/at/at3100a.uml
index 59eccc74e..a613228ae 100755
--- a/at/at3100a.uml
+++ b/at/at3100a.uml
@@ -146,6 +146,7 @@ END
 DATE F_DATA
 BEGIN
    PROMPT 45 6 "Data elaborazione "
+   CHECKTYPE REQUIRED
 END
 
 TEXT DLG_NULL