Workflow status update in X++

Hello All,

My workflow status isn't updating even after this method. I dont know what the problem is.

public server static void completeFromWorkflowEvent(RecId _recId)
{
#OCCRetryCount

SalesTable salesTable
;

try
{
// Every update must check the most current workflow approval status.
salesTable = SalesTable::findRecId(_recId, true);
//
// Validate that the current state allows for a transition to "Approved".
// "PendingApproval" is ok for transition to "Approved".
// If status is already "Approved" ignore the request.
//
if (salesTable.ReturnOrderApprovalStatus == LedgerJournalWFApprovalStatus::None ||
salesTable.ReturnOrderApprovalStatus == LedgerJournalWFApprovalStatus::NotSubmitted ||
salesTable.ReturnOrderApprovalStatus == LedgerJournalWFApprovalStatus::Submitted ||
salesTable.ReturnOrderApprovalStatus == LedgerJournalWFApprovalStatus::ChangeRequested)
{
// An invalid status change has been detected.
ReturnlWFApprovalStatusManager::invalidWorkflowStatusChangeError();

// throw error(strfmt("@SYS107962", ledgerJournalTable.JournalName, ledgerJournalTable.JournalNum));
}
else if (salesTable.ReturnOrderApprovalStatus == LedgerJournalWFApprovalStatus::PendingApproval)
{
salesTable.ReturnOrderApprovalStatus = LedgerJournalWFApprovalStatus::Approved;
ttsbegin;
salesTable.update();
ttscommit;
}

}

catch (Exception::Deadlock)
{
if (xSession::currentRetryCount() >= #RetryNum)
{
throw Exception::Deadlock;
}
else
{
retry;
}
}
catch (Exception::UpdateConflict)
{
if (appl.ttsLevel() == 0)
{
if (xSession::currentRetryCount() >= #RetryNum)
{
throw Exception::UpdateConflictNotRecovered;
}
else
{
retry;
}
}
else
{
throw Exception::UpdateConflict;
}
}
}