Validation fails and the exception reads Error: You must specify a class for transactions in fund [value].
If all distributions have the class defined, please contact Support and reference this article. A copy of the database may be needed.
Steps to Duplicate
Go to Administration>Post.
Choose New Post Parameter.
Filter on necessary information.
Validation Failed. View error: Error: You must specify a class for transactions in fund [#].
When viewing the fund in General Ledger>Configuration>Funds, the fund has a class defined. When viewing the transaction causing the error in Accounts Receivable, a class is also defined in the GL Distribution.