SET TERM ^ ;

CREATE OR ALTER PACKAGE NEW_PACKAGE1
AS
BEGIN
  PROCEDURE proc1 (
    param1 INTEGER,
    param2 INTEGER = NULL
  );

  PROCEDURE proc2;
END^

RECREATE PACKAGE BODY NEW_PACKAGE1
AS
BEGIN
  PROCEDURE proc1 (
    param1 INTEGER,
    param2 INTEGER
  )
  AS
  BEGIN
    -- Code
  END

  PROCEDURE proc2
  AS
    DECLARE VARIABLE v_operdate TIMESTAMP;
  BEGIN
    -- Вот так Debug package (F8) работает
    -- EXECUTE PROCEDURE proc1(1, 2);

    -- А вот так не работает. Ошибка
    EXECUTE PROCEDURE proc1(1);
    /*
      Текст ошибки

      This operation is not defined for system tables.
      unsuccessful metadata update.
      RECREATE PACKAGE BODY IBE$DBG$PKG$1 failed.
      Dynamic SQL Error.
      Input parameter mismatch for procedure IBE$DBG$PKG$1.PROC1.
    */
  END

END^

SET TERM ; ^

SET TERM ^ ;

CREATE OR ALTER PACKAGE NEW_PACKAGE1
AS
BEGIN
  PROCEDURE proc2;
END^

RECREATE PACKAGE BODY NEW_PACKAGE1
AS
BEGIN
  PROCEDURE proc1 (
    param1 INTEGER,
    param2 INTEGER = NULL
  )
  AS
  BEGIN
    -- Code
  END

  PROCEDURE proc2
  AS
    DECLARE VARIABLE v_operdate TIMESTAMP;
  BEGIN
    EXECUTE PROCEDURE proc1(1);
    /*
      Текст ошибки при попытке запустить отладку

      This operation is not defined for system tables.
      unsuccessful metadata update.
      RECREATE PACKAGE BODY IBE$DBG$PKG$1 failed.
      Default values for parameters are allowed only in declaration of packaged procedure IBE$DBG$PKG$1.PROC1.
    */
  END

END^

SET TERM ; ^