How to manage optional output parameters in an object method ?

Hi Abapers,
I've a little coding point to clarify in object programming :
I've defined an output method parameter as optional.
I want to prevent execution error with the following test :
IF et_my_ouput_paramer IS REQUESTED.
APPEND LINES OF lt_my_data_found TO et_my_ouput_paramer . "*(or other value affectation, no matter)
ENDIF.
When activating the code, I obtain the following error :
"IS REQUESTED" is allowed only with function parameters. This means
that it is allowed only within the relevant function module and not
with pure incoming parameters.
Effectively, I usely use "IS REQUESTED" for module-function... What's the correct syntax in object method ?
Thanks in advance.

OK, guys, it was a very tricky and basic error...
Sorry for this topic, I mistake in declaring type of my parameters.
Keep programming Quietly !
Have a nice day.

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