Message type: E = Error
Message class:  KZ - Cost Object Repetitive Mfg / Process Mfg 
Message number: 057
Message text: Cost object category & does not exist
The cost object category you entered does not exist.
Choose an existing cost object category or create cost object category
&v1&.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message KZ057 indicates that a specified cost object category does not exist in the system. This error typically arises when you are trying to post costs or perform transactions related to cost objects (like internal orders, projects, etc.) and the system cannot find the relevant cost object category.
Cause: Incorrect Cost Object Category: The cost object category you are trying to use may not be defined in the system.
Configuration Issues: The cost object category may not have been properly configured in the controlling (CO) module. Typographical Errors: There may be a typo in the cost object category code you are using. Missing Authorizations: The user may not have the necessary authorizations to access the cost object category.
Solution: Check Cost Object Category: Go to the configuration settings in SAP (Transaction code: SPRO). Navigate to Controlling > Cost Element Accounting > Master Data > Cost Object Categories. Verify if the cost object category you are trying to
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
KZ056 Cost object & is already marked as top node of hierarchy (*)
What causes this issue?  The cost object ID is already defined as the highest level in the cost object hierarchy when '*' was entered in the...
KZ055 Cost object & was marked as top node of hierarchy (*)
What causes this issue?  Cost object ID &v1& was defined as the highest level in a cost object hierarchy when '*' was entered in the...
KZ058 You cannot maintain or display & & with this function
What causes this issue?  You attempted to maintain &V1& &V2& using an unsuitable function.How to fix this error?  The system recognize...
KZ059 Cost object category & not allowed with this function
What causes this issue?  You are attempting to perform a function with a cost object ID whose cost object category does not allow this function.How to...
Click on this link to search all SAP messages.