ALTER FUNCTION "money"."GetBalans"(In @OrderId bigint,In @DateTime timestamp default null)
RETURNS decimal( 12 , 4 )
DETERMINISTIC
BEGIN
...
RETURN return_name;
END

CALL "money"."GetBalans"("@OrderId" =  1 ,"@DateTime" = convert(timestamp,'2008-01-01 13:21'))

Execution time:  0 . 766  seconds
Procedure completed

return_name

select "money"."GetBalans( 1 ,convert(timestamp,'2008-01-01 13:21'))

select "money"."GetBalans"( 1 ,convert(timestamp,'2008-01-01 13:21'))