The parameters Available Stock and Finished must have
EQUAL ID in all document types for orders!
Check is run for sales orders and purchase orders separately.
Thus status with the ID "1" for example has the same properties for the above-mentioned
parameters in all document types for sales orders. The same holds goods for
purchase orders.
Unlike with sales orders the status with the ID "1" of the two parameters can be
different in purchase orders.
If you were to change any of the above parameters in order status, an IRIS
warning is returned.

Solution:
1. Confirm the changes made and modify the oaramter Available Stock
and/or Finished for all same statuses across all document types for
orders (purchase and sales orders).
2. Cancel the changes made in order status.