Client Tools :: How To Pass Ambersand (&) As Input Parameter To A Stored Procedure

i have a stored procedure whose input parameter is a varchar2 datatype.i created this procedure for an interface and tibco would be calling my procedure by passing input parameters.my problem is when there is a input string with & (ambersand) then its not working.

even i tried to pass the parameter with & in TOAD, it asks me to enter value for string.look at the sample code below which i wrote for testing purpose:

procedure is:

create or replace procedure testproc(p_in in varchar2)
is
begin
null;
end;

i pass parameter as given below:

begin
testproc('abc & def');
end;

if i run above script, it asks me to input some string value as it sees & in the string. attached is the image that shows up in TOAD. if i run below script it works. but i dont know how many &'s will be there in the input parameter. hence i cant do. and also TIBCO cant modify the input paramter while calling the procedure.

begin
testproc('abc &'||'def');
end;