Question on using protected objects

["DuckE" <nospam_steved94@home.com>]

Without getting into the details of what I'm leading up to, is the line
marked in the text
code snippet below a valid thing to do?

  SUBTYPE aWaitSelect IS INTEGER RANGE 1 .. 3;
  TYPE aWaitArray IS ARRAY( aWaitSelect ) OF BOOLEAN;

  PROTECTED TYPE aQueueingType IS
    ENTRY GetEntry( waitSelect  : aWaitSelect; getResult : out Integer );
    PROCEDURE Release( waitSelect  : aWaitSelect );
  PRIVATE
    ENTRY WaitForIt( aWaitSelect );
    waitFlag : aWaitArray := ( OTHERS => FALSE );
    counter  : Natural := 0;
  END aQueueingType;

  PROTECTED BODY aQueueingType IS
    PROCEDURE Release( waitSelect : aWaitSelect ) IS
    BEGIN
      waitFlag( waitSelect  ) := TRUE;
    END Release;
    ENTRY GetEntry( waitSelect : aWaitSelect;
                     getResult : out Integer ) WHEN GetEntry'COUNT = 0 IS
    BEGIN
      getResult := counter;
      counter := counter + 1;
      REQUEUE WaitForIt( waitSelect );
    END GetEntry;
    ENTRY WaitForIt ( FOR waitSelect IN aWaitSelect )
         WHEN waitFlag( waitSelect ) IS  -- <<<<<<<<<<<< is it OK to use
waitSelect here???
    BEGIN
      waitFlag( waitSelect ) := FALSE;
    END WaitForIt;
  END aQueueingType;


Thanks in advance,
SteveD