what is 'at line-selection' and user command?

Answer Posted / rammohan

at line-selection validates the entire line and displays
the secondary list based on 1st list condition means where
ever u double-click on line it validates.

sy-lisel+0(field_length) = <conditin>.

at user-command validates the function keys to displys the
secondary list based on primary list conditions.

for this we are using sy-ucomm = <fcode>.

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