Line type changes to transfer order lines.

Currently we have extensive use of transfer order processing in our organisation to handle inter-company orders. Occasionally an order will be placed by a partner company for goods that we would require to be direct shipped. Our order processing team would like to change the line type on the transfer sales order to a 'D' and enter a supplier code. However this is not possible since the line type is not able to be changed. The alternative is that the original line is cancelled and a new line created with the line type set to 'D' and a supplier code.