Using /1BCDWB/DOCPARAMS - LANGU in Interface coding initialization

Hello,
I have build an pdf interactive offline form using a DDIC form interface. I am using this interface (FM) in my print report like
call function module fm_name
exporting
/1BCDWB/DOCPARAMS
One important parameter of /1BCDWB/DOCPARAMS that is filled in my print report is obviously LANGU.
As you know you can have alternative language in AIF that are used when the LANGU isn't available. (REPLANGU1, REPLANGU2 and REPLANGU3)
The challenge I am currently struggeling with is, how to get these information in my "coding initialization" part of my interface.
Either I would like to have the langu variable of /1BCDWB/DOCPARAMS or even better the final language that is used to create the pdf form.
I have tried to use /1BCDWB/DOCPARAMS-LANGU directly in my coding initialization and I have tried to define /1BCDWB/DOCPARAMS as an input parameter of the coding initialization (as all the other import parameters).
However, when I try to activate it gives me the error that /1BCDWB/DOCPARAMS is unkown.
Do you have an idea how to get the pdf language in the coding initialization?
BR
Carsten

Hi,
To display form in login language refer below code...and To change the form element labels you do need to translate the form in different languages use t-code se63.
data : LW_SFPDOCPARAMS type SFPDOCPARAMS.
LW_SFPDOCPARAMS-LANGU = SY-LANGU.
CALL FUNCTION 'XXXXXXXXXXX'
EXPORTING
/1BCDWB/DOCPARAMS = LW_SFPDOCPARAMS
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Using /1BCDWB/DOCPARAMS - LANGU in Interface coding initialization

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