Change Material in Sales Order Line Item Using BAPI_SALESORDER_CHANGE

Hello All , I want  to change sales order line item material through BAPI_SALESORDER_CHANGE , I have written all those required ABAP codes , but still am getting an error : “Field ‘MATNR’ cannot be changed, VBAPKOM 000010 ready for input”

Kindly guide me the steps to achieve this .

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