Show ALV with a Field like a Table Type

Hello Everyone, I hope anyone can help me.

I’m using CL_SALV_TABLE and I would like to show ALV with a field that contains the table RETURN of BAPI_ACC_DOCUMENT_POST.
To be clear: if I must show 3 records into ALV, each record can have a number of columns and one of these columns must contain the table RETURN.

Could you write me the code?
I tried to do it but the column is not shown. 

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