HOW to pass data to unit type field of fun module

Hi All,

I am facing a problem to pass the data to a fun module parameter of type unit(size is 3) my field is MARA-MEINS

this is a fun module import parameter I have to pass 'MLB' VALUES to this how to pass this value?I am getting a dump but the same it's taking when I am giving in sE 37 the fun module is MD_CONVERT_MATERIAL_UNIT.

Thanks&Regards

Mahesh