Answer / malli.gontla

Hi rahul, i think u r newer and also learning abap.

i am giving the idea to u. u just follow my points.

in selection criteria u use select-options statement
eg: select-options <field> for <table-field>
here <field> is name of field and
<table-field> is name of table filed( ur field customer no)

u write a query for basic list in start-of-selection block.
and u must write hide statement after first sql query only.
hide is mainly used to display secondary lists. then u write
write At line-selection event for secondary lists.
in this event u write sy-lsind=1 for first secondary list
and for second secondary list sy-lsind=2. so on. up to u can
write 20 secondary lists, but only one basic list.

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