Read hashed internal table with runtime key

Hi all,

we are trying to obtain this result:

• We have a source standard table itab
• We want transform this table to a hashed table
• The unique key of the hashed table must be calculated at runtime (e.g. the columns of the table used as key are known only at runtime)
• Then we want to read data from the table using the key defined above.

We are able to convert the standard table to a hashed table but we are not able to define the key at runtime.

We found this: Reading Lines of Tables (SAP Library - ABAP Programming (BC-ABA))

If you do not know the name of one of the key fields until runtime, you can specify it dynamically as the content of a field n₁... n_n using (n₁)
= f₁ (n₂) = f₂ If the data types of f₁... f_n are not compatible with the key fields, the system converts them. If the row type of the internal table is not structured, you can specify a comparison with the pseudo-component table_line.

But we cannot understand how does it work.

Could you help us?

Thank you