Code for capturing changes to purchasing table

I need to use a generic DS to capture changes to purchasing table EKET and need to delta enable it using BTE. I plan to use "01000740 APO-PlugIn: Goods receipt for purchase order" and need to edit the sample FM given (transaction FINF) for the purpose. The sample FM looks like...

FUNCTION SAMPLE_INTERFACE_01000740.

*"----

""Lokale Schnittstelle:

*" IMPORTING

*" VALUE(I_ELIKZ) LIKE EKPO-ELIKZ OPTIONAL

*" TABLES

*" T_XEKET STRUCTURE EKET OPTIONAL

*"----

(Need to add code here for capturing changes to table EKET)

ENDFUNCTION.

Can anyone help me with this?

AB