Receiving is possible for items from production and purchase orders with state processing.
Raw materials to produce a finished product (the one to receive) should be shipped to production prior to receiving.
The receivable quantity maximum is calculated for all item types (purchase or production). It's not possible to receive a higher quantity than purchased.
If a higher quantity is entered in the reception form a failure notice will be shown like:
Failure: Qty  exceeds maximum receivable of . In this case you like to receive a quantity of 1 but the maximum receivable quantity is 0.
Based on shipped raw materials the maximum receivable quantity is calculated in case of production.