Goods Receipt Posting for By-Products 
When the destination PI04 receives a process message of category PI_CONS, the system normally posts a goods issue for the material. However, if the material quantity is reported for a by-product, that is, a negative material list item, a goods receipt is posted for the material.
The message data is processed in the following way:
Material quantity:
The material quantity produced has to be specified as a positive number in the process message.
Reservation number and item:
From the reservation item specified in the process message, the system determines the movement type to be posted, that is, "Receipt of a by-product".
If the reservation number and item is not specified in the process message, the system will search for a reservation matching the order and material numbers as well as the operation or phase number contained in the process message.
If a message contains both the numbers of the phase and the superior operation and the material is assigned to both, the goods receipt is posted to the phase.
If several reservation items matching the message data are found, the goods receipt is posted to the first reservation item for which a delivery completion indicator has not yet been set, and a corresponding warning is written to the message log.
If the delivery completion indicator has been set for all the reservation items found, the goods receipt is posted to the last reservation item.
Caution
You cannot use a PI_CONS message to post a goods receipt for a by-product if this by-product is not contained in a reservation. If the system cannot find a valid reservation item for the material specified in the process message, it will post an unplanned goods issue for the material.
After the goods receipt is posted, the numbers of the reservation and the reservation item are written to the message log, if they were not defined in the message.
Batch number:
If batch management is not required for the material according to its master record, but a batch number has been specified in the message, this number is ignored.
If batch management is required for a material according to its master record, the system will search for a batch number first in the process message and then in the reservation.
If the batch number has not been maintained there, an error message is written to the message log and the message status is set to "destination error".
If a batch with the specified number does not yet exist in the system, the batch is created when the goods receipt is posted.
Storage location:
If no storage location is specified in the process message, the goods receipt is posted to the storage location maintained in the reservation.
If this has not been maintained either, an error message is written to the message log and the message status is set to "destination error".
Material document
When the goods receipt is posted, the system creates a corresponding material document. The number of this material document is written to the message log.
See also:
Section Goods Receipts for Orders in the document MM Inventory Management