Hello Gupta
From a valuation point of view, the posting with 631 from E to W (in one step) is treated exactly as if the same procedure had been executed in two steps.
When posting in two steps, you would first make a posting from E to the unrestricted-use stock using movement type 411 and thus you would carry out a value-based transfer to your own stock. Then, movement type 631 would be used to post from the unrestricted-use stock to W. The posting logic (or its result) must be exactly the same in the one-step procedure as if the same transaction was posted in two steps. For the origin of the values, the system uses the value from MBEW as the source for non-valuated E stock.
The movement is a mix of two movement types: 411E Goods issue from sales order stock and 631 from unrestricted stock to customer consignment. So the system compares the valuation of the sales order with the valuation of the material master. This is the reason why AUM document is created.
There is a workaround:
1. Create a separate Storage Location called "Customer Consignment".
2. When you physically deliver the goods to your customer, you will just need to post a 311E to this storage location.
3. When your customer buys the goods, you can post the Goods Issue from your Storage Location from the Sales Order Stock.
I hope this can help,
Anna