Hi Vaibhav,
The limit of 500 is provided by default so that user does not end up executing is for a very large number of data. This is user specific and can be changed. Try following:
1) Go to Help-> Settings -> Max. number of hits to be displayed(Increase the size)
2) Update Field value for TBMAXSEL of table RSEUMOD ( Xn SE11/SE16 ) to have the number of entries that needs to be defaulted for that user. RSEUMOD is the table that contains the default workbench config entries for a user.
3) Change the function module of corresponding search help:
...
IF callcontrol-step = 'PRESEL'.
callcontrol-MAXRECORDS = 1000
EXIT.
ENDIF.
I will check specifically for dispute cases and come back to you. In the mean while you can try above suggestion and let us know if they work for you.
Regards
Pankaj Pareek