Code in the InfoObject routine

Hi,

I am trying to load text for the master data infoobject from a DSO. The infoobject ZI_PRFAM is an attribute of 0Material. It gets loaded when 0Material gets loaded from R/3. The DSO gets data from non-R/3 system. Below is the screen shot of transformation where ZI_PRFAM is same as  C_GPF but its not key field in the DSO. The text will be C_GPF_TXT. The key object 0Company also exist as an attribute of 0Material.

Can someone help me to write a code in the infoobject routine? Please see the transformation attached.

Thanks in advance.

Regards,

B