diff --git a/ba/ba7100.cpp b/ba/ba7100.cpp
index 4824c6682..28bee9ecd 100755
--- a/ba/ba7100.cpp
+++ b/ba/ba7100.cpp
@@ -9,6 +9,7 @@
 #include <golem.h>
 #include <netsock.h>
 #include <recarray.h>
+#include <relation.h>
 #include <sheet.h>
 #include <tabutil.h>
 #include <utility.h>
@@ -433,14 +434,29 @@ TFilter_expr::TFilter_expr(TAutomask& m, int logicnum, const char* expr)
       logicnum = LF_TABCOM;   // Niente errori fatali, se possibile
       
     const TRectype rec(logicnum);
-    for (int i = 0; i < numvar(); i++) if (!rec.exist(varname(i)))
-    {
-      _error = 883;
-      TString msg;
-      msg.format(FR("Il campo %s non appartiene al file %d"), varname(i), logicnum);
-      print_error(msg);
-      break;
-    }
+
+		for (int i = 0; i < numvar(); i++)
+		{
+			const TFixed_string name(varname(i));
+			int num = logicnum;
+			bool ok = rec.exist(name);
+
+			if (!ok)
+			{
+				const TFieldref f(name, 0);
+				int num = table2logic(f.id());
+				const TRectype join(num);
+				ok = join.exist(f.name());
+			}
+			if (!ok)
+			{
+				_error = 883;
+				TString msg;
+				msg.format(FR("Il campo %s non appartiene al file %d"), varname(i), logicnum);
+				print_error(msg);
+				break;
+			}
+		}
   }
 }