This Validation Error means you are not currently attached to an Open Reference Batch.
Another User might close a Reference Batch that you are using.
In the upper right corner, select the Reference Batch link.
Open and Attach to the Reference Batch.
If you forgot to attach to a Reference Batch, you can Open and Attach to an existing Reference Batch or create a new Reference Batch and attach to it.
If the Claim is already in another Reference Batch, it can be moved to the correct Reference Batch.
The System Setting DETACHINC must be set to No for Incomplete Charges to attach to the Reference Batch.
By default, the Received Date is populated by the Paid Date on the ERA File.
If you want the Received Date to be a different Date, there is a System Setting to allow the entry of a Received Date on the Reference Batch (ERARECEIVEDDATE) (Release 4.7)