Message type: E = Error
Message class:  KZ - Cost Object Repetitive Mfg / Process Mfg 
Message number: 706
Message text: Enter a plant
You are attempting to assign a single object to
<DS:GLOS.CO_product_group>CO product group</> &v1&. A plant must be
specified for this single object.
However, you have not specified a plant.
Enter a plant for the single object.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message KZ706 ("Enter a plant") typically occurs when a user attempts to perform an action that requires a plant code, but the plant field is either empty or not properly filled in. This error is common in various transactions related to materials management, production planning, or inventory management where a plant is a mandatory field.
Cause:
Missing Plant Information: The most common cause is that the user has not entered a plant in the relevant field.
Incorrect Configuration: The system may not be configured correctly to recognize the plant, or the plant may not be set up in the system.
User Role/Authorization Issues: The user may not have the necessary authorizations to view or select the plant.
Transaction Context: The specific transaction being executed may require a plant to be specified, and it is not being provided.
Solution:
Enter a Plant: The simplest solution is to ensure that you enter a valid plant code Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
KZ705 Controlling area & not the same as that of higher-level product group
What causes this issue?  You have entered a controlling area that is not the same as that of the higher-level <DS:GLOS.CO_product_group>CO produ...
KZ704 Controlling area of higher-level product group used
What causes this issue?  You did not specify a controlling area, so the system is using the controlling area of the higher-level <DS:GLOS.CO_produc...
KZ707 Product group & is flagged for deletion - assignment not allowed
What causes this issue?  <DS:GLOS.CO_product_group>CO product group</> &v1& is flagged for deletion and therefore cannot be assign...
KZ708 No lower-level product groups are assigned to product group &
What causes this issue?  No product groups are assigned to <DS:GLOS.CO_product_group>CO product group</> &v1&.System Response  The...
Click on this link to search all SAP messages.