Finding Export from Import

Hi All,

   I have a requirement to add a field from table in an user exit in include  ZXM08U26 but before adding the field I need to IMPORT the value of the field in this include. I had seen other fields from the same table are IMPORTED into this include using    IMPORT z_part FROM MEMORY ID    'ZPARTN'.  But I do not know where the EXPORT TO MEMORY ID is written. Please can someone help.

Thanks in advance,

Priya