diff --git a/ab/batbpdb.uml b/ab/batbpdb.uml
index 833729806..e53628563 100755
--- a/ab/batbpdb.uml
+++ b/ab/batbpdb.uml
@@ -18,6 +18,7 @@ STRING F_CODTAB 2
 BEGIN
   PROMPT 2 1 "Codice tabella "
   HELP "Codice della tabella periodi di bilancio"
+  FLAS "U_"
   FIELD %PDB->CODTAB
   KEY 1
   USE %PDB KEY 1