Hi,
I have the following requirement in a B2B process.
Purchase Orders are coming from 3rd party system to ECC through IDoc (type ORDERS05) and creating Sales Order. Whenever an Orderchage is coming, I have to check whether some fields (which are maintained in a custom config table) value are changed. If yes, I have to stop processing of this IDoc and stage it for review. (IDoc's will be picked up for review through another program). eg: VBAP-Qty field may be maintained in the custom table, so I have to check the Qty in the Purchase Order change IDoc. I am facing issue here to compare the fields becuase the fields in Purchase Order and Sales Order are different. Could anyone please let me know how to achieve this??? 
Thanks in advance