How to set dynamic key for READ TABLE?

I'm trying to work out a way to read an internal table that has to be created dynamically. I have created the following report that fills a dynamic internal table with data. On the last line, I'm trying to read it with a key (`mandt` for example), but I I get this syntax error: The specified type has no structure and therefore no component called MANDT I have debugged and I can see that `<any_tab>` has been populated successfully and the structure of the table (field names) are correct. The problem presents itself when I try to read the table into a work area. Maybe I'm doing this wrong, but it seems like something that should be possible to do, and I have a feeling I'm missing something small. The reason I am trying this out is that I have found identical selects happening in a program and want to buffer records in memory and read them from there to avoid DB accesses. This is easy to implement, however I haven't done this when the table, `where` clause and `into` clause of the OPEN SQL statement I'm trying to optimize are dynamic. How to correct the syntax error? ``` DATA: t681_rep TYPE TABLE OF t681 , wa_681 LIKE LINE OF t681_rep, tabref TYPE REF TO data , waref TYPE REF TO data. FIELD-SYMBOLS: <any_tab> TYPE ANY TABLE, <any_wa> TYPE ANY, <var1> TYPE ANY. "fill t681_rep SELECT * FROM t681 INTO TABLE t681_rep UP TO 1 ROWS WHERE kotab = 'A002'. READ TABLE t681_rep INTO wa_681 WITH KEY kotab = 'A002'. IF sy-subrc = 0. "if A002 is found create a table of that type and fill it CREATE DATA tabref TYPE TABLE OF (wa_681-kotab). ASSIGN tabref->* TO <any_tab>. SELECT * UP TO 10 ROWS FROM (wa_681-kotab) INTO TABLE <any_tab>. ENDIF. CREATE DATA waref TYPE a002. ASSIGN waref->* TO <any_wa>. READ TABLE <any_tab> ASSIGNING <any_wa> WITH KEY mandt = '800'. <- problem area IF sy-subrc = 0. "do stuff with <any_wa>... ENDIF. ```