Custom fields from MPOS table should be added to ALV list of IP17.

Two custom fields from MPOS table should be added in the ALV list of the IP17 transaction.
Could you please help us in finding the correct enhancement spot for adding the fields in the ALV list of standard transaction of IP17 .
We have been through the sap note 586523 - Customer-defined fields in list editing- But it seems to be not helpful in our case.

The two fields are also visible in IP05 transaction under Customer enhancement item.

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