Mapping set with Input source of "Item Class" from Cost Management NOT available for assignment

Summary:

Content (please ensure you mask any confidential information):

Created a Mapping set (Created in Receivables) with Input source of "Item Class" from Cost Management Application. Attached to the Rule and this rule is NOT available for assignment in Journal Entry Rule Set (JERS).

Whereas a mapping set created with Input Source of Item Category from Receivables Application is available for assignment in JERS

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

23C

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