PO to Sales order automation

Hi,

I have one scenario to trigger automatic sales order from purchase order.

There are two company codes. A & B in the same client.

A : Will issue an account assigned PO for text item to B.

B: create a sales order against above PO.

My client wants an automation for the creation of Sales order.

I tried to do automate the using IDOC ( ORDERS / ORDERS05).