Can we add a new line to Internal sales order created from internal requisition

Hi Gurus,

We are trying to add a new line to internal sales order which is created from internal requisition. But it is showing a pop up message a new line cannot be added as it is internal sales order.

Could you please suggest me is this oracle functionality that we cannot add a new line to internal sales order or is there a way that we can add a new line to internal sales order.

If yes please let me know the steps to add new line to internal sales order.

Thanks in advance.

Regards,

Santhoshi