Goods Receipt Posting 
When a material has been produced in a process, a goods receipt for the order must be posted. Whether and how you can trigger the goods receipt posting using a process message depends on the type of material produced:
Goods Receipt for Header Material and Co-Products:
If you want to post a goods receipt for the header material of the order or for a co-product, you need to send a message of category PI_PROD to destination PI03. How the message data is processed depends on the inspection specifications defined for the material:
If an inspection is to be carried out during production using inspection points, the message is sent to QM, provided that one of the following process steps is defined in QM:
Assignment of partial lots or batches (see QM data for the recipe header, Partial-lot assign. field)
Recording of an inspection point quantity (see QM data for operation/phase, Insp.pointCompletion field)
After the inspection, you can post a goods receipt for each inspection point based on the inspection results.
In all other cases, the message is sent to inventory management. This means that the goods issue is posted directly.
Goods Receipt Posting via Quality Management
Goods Receipt Posting via Inventory Management
Goods Receipt for By-Products: If the material produced is a by-product for which a reservation item has been maintained, you can post the goods receipt by sending a message of category PI_CONS to destination PI04.
You cannot use a process message to post a goods receipt for a by-product that is not contained in a reservation.
Consistency Checks: :
The system checks whether the values contained in the message are valid and consistent with one another. If an inconsistency is discovered (for example, an invalid order number or a unit of measure that is not allowed for the material specified in the message):
The system writes a corresponding error or warning message to the message log
The system sets the process message status Destination error or Sent with warning