data:
lr_table type ref to cl_salv_table,
lr_column type ref to cl_salv_column_table.
lr_column ?= lr_table->get_columns( )->get_column( columnname = '...' ).
lg ADT
Theory is when you know something, but it doesn't work.
Practice is when something works, but you don't know why.
Programmers combine theory and practice: Nothing works and they don't know why.