Done ticket GEPAFINBE-172

src/main/java/net/gepafin/tendermanagement/util/Utils.java

@@ -785,5 +785,7 @@ public class Utils {
 
 		return input.matches("-?\\d+(\\.\\d+)?");
 	}
-
+	public static boolean isValidBoolean(String value) {
+		return "true".equalsIgnoreCase(value) || "false".equalsIgnoreCase(value);
+	}
 }