Item Standard Cost Missing which was defined earlier

Summary:

Item standard cost was defined and transactions were processed in Cost Accounting.

But all of sudden the cost is deleted from standard cost screen and costing transactions were ends with error.

Please help to overcome this issue as it stops cost processing and leads to month end issue.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):