According to the Workforce Central v6.3 Timekeeping Developer's Guide (login required), you can retrieved failed XML transactions from the Transaction Assistant with <FailedXMLTransaction>
.
FailedXMLTransaction Tag
The FailedXMLTransaction tag provides information about an XML transaction
that has failed an attempt to process an XML request. It is used to retrieve or modify failed XML transaction information.
Note: This tag provides information for the Transaction Assistant.
You can use the Load
action to view entries from the Transaction manager.
Load
Returns all failed transactions for the specified SourceName and
TransactionType. You must specify at least one of these properties
with the Load action; if you do not, an error is returned.
Return Value Type: Zero or more FailedXMLTransaction tags
Optional Properties: SourceName, TransactionType
The XML request below retrieves failed Pay Code Edits that were submitted by the Workforce Integration Manager.
<Kronos_WFC version='1.0'>
<Request Action='Load'>
<FailedXMLTransaction SourceName='WIM' TransactionType='Pay Code Edits'/>
<Request>
</Kronos_WFC>
As for editing transactions, I unfortunately couldn't find any way to do this with the XML API in v6.3.