Custom Fields in IW31/IW32/IW33 Transaction--Screen Visiblity Issue

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Hi All

I have used the enhancement IWO10018 to add custom fields in the service order(Transactions IW31/IW32/IW33).However I am not able to control the visibility of the fields by writing appropriate custom code in the PBO of the new sub-screen(SAPLXOIH/0900).The fields are still open for input in the display transaction IW33.I have added the fields in an append structure to AUFK table & on the screen the fields are defined as pointing to CAUFVD structure as is the case with the standard fields in the IW* transactions.

I am also not able to debug any code written by me in the PBO/PAI events of the subscreen. I need to incorporate some custom logic for displaying F4 for one of the fields based on the user input in some other tab.

Do we need to do some additional customizing so that::

1) The fields are not open for input in the display transaction IW33.

2) I am able to debug the code written in the PBO/PAI events of the subscreen.

Any pointers/solutions to the above problems will be appreciated.

Thanks.

Regards

Chetan