SAP Production Planning Table

Why is the need to restrict to only some of the messages? System divides the messages
into 2 categories from business side. Some messages are issued by the processing ABAP
program and they cannot be changed. Because the program cannot continue to run
without correcting those errors. But some messages do not result in any contradictions for
the processing program, but might affect the succeeding operations in that business
process.
Here's the example:
For the first case,
When creating the production order, we have to enter the order quantity. There's no way
thet system can continue if we do not enter the quantity. So there's no doubt that we
shouldn't be able to change the error type for this.
For the second case,
When i create a production order, i can create the batch number for the product in the
order before saving the order. And the system checks whether i entered the batch number
in the order or not. For the production order creation, it's not a must to enter product
batch number beforehand. System can save the order. We can create the product batch
separately, or even we can create it during goods receipt for order. Therefore, system
could allow us to change the message type to error or warning. If our production process
is desingned, so that the person making the goods receipt shouldn't enter other batch
number than that entered in production order, we should make the message type error, so
that the planner should have to create the batch number during creation. If however, we
only create the batch number during goods receipt, we should allow the planner not to
enter batch number beforehand... (This was just a fiction example, do not question it, and
don't look for this setting in the customizing)
Production Planning - Production
Control System Messages
You can manage the production control system messages with transaction
OPJB.
In this step you can specify whether the SAP System will :-
- suppress this information
- displays it as a warning
- displays it as an error message
In the case of the error message you can only process it further if you
correct the entry.
You can also group the messages according to user classes by saving the
messages in different
versions.
Process the list of messages by assigning every message a message
category.