Dunning form assigning form lanuguage

Hi,

My requirement as below.

I am having one Dunning Form EX: ZFIL_150_DUNN, Which has 3 Languages one is FR(French), NL(Netherlands), and DE(Germany).

How my SAP script will pick for a particular customer for particular Language.

Do i need to do any Configuartion or do i need to control through the Print program.

As my requirement is i am using Standard Print programe.

Regards,

Dwaraka.