abap - What does the syntax ->* mean? -

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i have read documents syntax ->*, still don't it. can explain means , in scenarios can use it?

i have syntax in example: 

assign ovs_callback_object->query_parameters->* <ls_query_params> casting.

the ->* operator "dereference" operator. turns type ref something type something.

in example, ovs_callback_object->query_parameters reference, don't want assign reference field-symbol, want assign actual field reference points to.


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