Reading HTTP Headers of Request in PUT method

Hi All,

We are able to read HTTP Headers of request in POST method, but not in PUT method.

in POST method (zentitySet_CREATE_ENTITY), we are able to read HTTP headers of request using following code.

    DATA: lt_request_header TYPE tihttpnvp,

          ls_request_header TYPE ihttpnvp.

    lt_request_header = me->mr_request_details->*-technical_request-request_header.

    READ TABLE lt_request_header INTO ls_request_header WITH KEY name = 'headername'.

Reading HTTP Headers, in PUT method (zentitySet_UPDATE_ENTITY), although the above code is comipling properly, it is giving runtime error

SYSTEM_DATA_ALREADY_FREE

Accessing data that has already been released is not permitted.

in PUT method, how can we get reference to request_header table.

thanks,

Madhu_1980