Hello Friends,
I recently encountered one issue related to open items selection -- free selections screens provided by SAP standard programs like f-32, f-28, f-44, f110 and f150. I found an interesting aspect which I would like to share:
Problem Description: In open item selection screen in f-32 customer would like to have more selection fields.
In standard SAP screen the fields are limited as below:
If we select document number:
Customer wanted to increase the number of selection fields.
Solution: Generally the first instinct is that for this kind of problem would be that modification will be needed with the help of ABAPer
However, in certain cases a more simple solution is available but might be overlooked because of the trickiness of SAP interface.
In cases like f-32,f-44, f-28 , f110 free selections you do not need any modification to the code.
You must try following before going for program change:
Simply enter (use) all the selection criteria and press enter. For example if you have chosen document numbers –
Then press enter. You will get below message:
This means the entered selection criteria are already filled in a buffer table and you are free to give further criteria !! 
Hence in such cases if you can inform the customer. If customer still persists that he needs more input fields in single screen then the modification required is only in GUI part of the program.
Exception: In case of the APP free selection screen this does not work. Hence in that case you will need to have more modifications in the program (F110_FLDTAB_1820)