SAP Note 22645 - ME2O monitoring stocks with subcontractor of vendor

Symptom:

According to the documentation, you can monitor the stock with subcontractor of the vendor using transaction ME2O. This is only possible if a current purchase order is active at the time of the evaluation. If there is no purchase order available at this time, no stocks are determined for the vendor although they are actually existing.
If at all, stocks of components are evaluated which exist as components in a current purchase order.

Cause and prerequisites

Incomplete documentation: Only the open order items are interesting here, because the reason of the evaluation is to find out whether there are sufficient components in the stock of material provided for an order item. Therefore a check is made prior to further selections whether the "delivery completed" indicator (EKPO-ELIKZ) is set or whether the quantity (EKPO-MENGE) is zero (items for which the deletion indicator is set are not considered, of course).

Solution
The system works as required.