Message type: E = Error
Message class:  CMM_MEV_GEN_WL - Period-End Valuation: Worklist 
Message number: 000
Message text: Posting date &1 not in same period as valuation key date &2
The valuation key date &V2& of valuation result and the
entered posting date &V1& for the accrual document are in
different periods.
You cannot transfer the valuation result into the accrual document.
Contact your system administrator.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CMM_MEV_GEN_WL000 indicates that there is a mismatch between the posting date and the valuation key date in a transaction. Specifically, the error message states that the posting date (&1) is not in the same period as the valuation key date (&2). This typically occurs in the context of materials management or inventory valuation processes.
Cause: Date Mismatch: The posting date of the transaction you are trying to execute falls into a different accounting period than the valuation key date. This can happen if: The posting date is in a future or past period that is not open for posting. The valuation key date is set to a specific date that does not align with the posting date. Period Closing: The accounting period may have been closed for the posting date, preventing any transactions from being recorded in that period.
Configuration Issues: There may be configuration settings in the system that restrict posting
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CMM_MEV_GEN_UI022 Accrual document approved but not posted
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CMM_MEV_GEN_UI021 Accrual document &1 &2 not displayed; authorization is missing
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CMM_MEV_GEN_WL001 Cannot create test data, valuation result for &1 &2 &3 already exists
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CMM_MEV_GEN_WL002 Goods receipt / delivery item(s)calculated: &1 successfully &2 with error
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.