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Adding search helps to SAP standard

Hi all,

I'm working on a requirement to add a couple of search helps to a SAP standard screen.

I don't want to put check tables against the data dictionary objects as they are required for this one specific screen only.

There are two fields A and B. There is a one to many relationship between A and B.

I've managed to manipulate the search help exit for B using 'DYNP_VALUES_READ' so that the values displayed for field B are dependant on what the user has entered for field A.

However, I'm having problems with the final part of the requirement - if the user has left field A blank, and then selects something from column B - the corresponding value for A should automatically default onto the screen.

I've tried using 'DYNP_VALUES_UPDATE' and whilst sy-subrc is returned as 0, it doesn't work.

Any ideas on how to do this? I am trying if possible to do all procesing within the search help exits as I want to avoid making any modifications to the screen flow logic if possible - trying to minimise the SAP standard mods as much as I can.

Thanks in advance,

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